A General Introduction to Cloud Computing

Updated on November 2, 2020

Senior Manager, DevEd

A General Introduction to Cloud Computing


The impact of cloud computing on industry and end users would be difficult to overstate: many aspects of everyday life have been transformed by the omnipresence of software that runs on cloud networks. By leveraging cloud computing, startups and businesses are able to optimize costs and increase their offerings without purchasing and managing the hardware and software themselves. Independent developers are empowered to launch globally-available apps and online services. Researchers can share and analyze data at scales once reserved only for highly-funded projects. And internet users can quickly access software and storage to create, share, and store digital media in quantities that extend far beyond the computing capacity of their personal devices.

Despite the growing presence of cloud computing, its details remain obscure to many. What exactly is the cloud, how does one use it, and what are its benefits for businesses, developers, researchers, government, healthcare practitioners, and students? In this conceptual article, we’ll provide a general overview of cloud computing, its history, delivery models, offerings, and risks.

In this article, you will gain an understanding of how the cloud can help support business, research, education, and community infrastructure and how to get started using the cloud for your own projects.

What is Cloud Computing?

Cloud computing is the delivery of computing resources as a service, meaning that the resources are owned and managed by the cloud provider rather than the end user. Those resources may include anything from browser-based software applications (such as Tik Tok or Netflix), third party data storage for photos and other digital media (such as iCloud or Dropbox), or third-party servers used to support the computing infrastructure of a business, research, or personal project.

Before the broad proliferation of cloud computing, businesses and general computer users typically had to buy and maintain the software and hardware that they wished to use. With the growing availability of cloud-based applications, storage, services, and machines, businesses and consumers now have access to a wealth of on-demand computing resources as internet-accessed services. Shifting from on-premise software and hardware to networked remote and distributed resources means cloud users no longer have to invest the labor, capital, or expertise required for buying and maintaining these computing resources themselves. This unprecedented access to computing resources has given rise to a new wave of cloud-based businesses, changed IT practices across industries, and transformed many everyday computer-assisted practices. With the cloud, individuals can now work with colleagues over video meetings and other collaborative platforms, access entertainment and educational content on demand, communicate with household appliances, hail a cab with a mobile device, and rent a vacation room in someone’s house.

Defining Cloud Computing

The National Institute of Standards and Technology (NIST), a non-regulatory agency of the United States Department of Commerce with a mission to advance innovation, defines cloud computing as:

a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction.

NIST lists the following as the five essential characteristics of cloud computing:

  • On-demand self-service: Cloud resources can be accessed or provisioned without human interaction. With this model, consumers can gain immediate access to cloud services upon signup. Organizations can also create mechanisms for allowing employees, customers, or partners to access internal cloud services on demand according to predetermined logics without needing to go through IT services.
  • Broad network access: Users can access cloud services and resources through any device and in any networked location provided that they have permission.
  • Resource pooling: Cloud provider resources are shared by multiple tenants while keeping the data of individual clients hidden from other clients.
  • Rapid elasticity: Unlike on-premise hardware and software, cloud computing resources can be rapidly increased, decreased, or otherwise modified based on the cloud user’s changing needs.
  • Measured service: Usage of cloud resources is metered so that businesses and other cloud users need only pay for the resources they use in any given billing cycle.

These characteristics offer a wide variety of transformative opportunities for businesses and individuals alike, which we’ll discuss later in the section Benefits of Cloud Computing. To gain some additional context, let’s briefly review the emergence of cloud computing.

History of Cloud Computing

Many aspects of cloud computing can be traced as far back as the 1950s, when universities and companies rented out computation time on mainframe computers. At the time, renting was one of the only ways to access computing resources as computing technology was too large and expensive to be owned or managed by individuals. By the 1960s, computer scientists like John McCarthy of Stanford University and J.C.R Licklider of The U.S. Department of Defense Advanced Research Projects Agency (ARPA) began proposing ideas that anticipated some of the major features of cloud computing today, such as the conceptualization of computing as a public utility and the possibility of a network of computers that would allow people to access data and programs from anywhere in the world.

Cloud computing, however, didn’t become a mainstream reality and a popular term until the first decade of the 21st century. This decade saw the launch of cloud services like Amazon’s Elastic Compute (EC2) and Simple Storage Service (S3) in 2006, Heroku in 2007, Google Cloud Platform in 2008, Alibaba Cloud in 2009, Windows Azure (now Microsoft Azure) in 2010, IBM’s SmartCloud in 2011, and DigitalOcean in 2011. These services allowed existing businesses to optimize costs by migrating their in-house IT infrastructure to cloud-based resources and provided independent developers and small developer teams resources for creating and deploying apps. Cloud-based applications, known as Software as a Service (SasS) — which we’ll discuss in greater detail in the Cloud Delivery Models section — also became popular during this time period. Unlike on-premise software, or software that users need to physically install and maintain on their machines, SaaS increased the availability of applications by allowing users to access them from a variety of devices on demand.

Some of these cloud-based applications — such as Google’s productivity apps (Gmail, Drive, and Docs) and Microsoft 365 (a cloud-based version of the Microsoft Office Suite) — were offered by the same companies that launched cloud infrastructure services, while other pre-existing software products, such as Adobe Creative Cloud, were launched as cloud-based applications using the services of cloud providers. New SaaS products and businesses also emerged based on the novel opportunities of these cloud providers, such as Netflix’s streaming services in 2007, the music platform Spotify in 2008, the file-hosting service Dropbox in 2009, the video conferencing service Zoom in 2012, and the communication tool Slack in 2013. Today, cloud-based IT infrastructure and cloud-based applications have become a popular choice for both businesses and individual users and their market share is expected to grow.

Cloud Delivery Models

Cloud resources are provided in a variety of different delivery models that offer customers different levels of support and flexibility.

Infrastructure as a Service (IaaS)

IaaS is the on-demand delivery of computing infrastructure, including operating systems, networking, storage, and other infrastructural components. Acting much like a virtual equivalent to physical servers, IaaS relieves cloud users of the need to buy and maintain physical servers while also providing the flexibility to scale and pay for resources as needed. IaaS is a popular option for businesses that wish to leverage the advantages of the cloud and have system administrators who can oversee the installation, configuration, and management of operating systems, development tools, and other underlying infrastructure that they wish to use. However, IaaS is also used by developers, researchers, and others who wish to customize the underlying infrastructure of their computing environment. Given its flexibility, IaaS can support everything from a company’s computing infrastructure to web hosting to big data analysis.

Platform as a Service (PaaS)

PaaS provides a computing platform where the underlying infrastructure (such as the operating system and other software) is installed, configured, and maintained by the provider, allowing users to focus their efforts on developing and deploying apps in a tested and standardized environment. PaaS is commonly used by software developers and developer teams as it cuts down on the complexity of setting up and maintaining computer infrastructure, while also supporting collaboration among distributed teams. PaaS can be a good choice for developers who don’t have the need to customize their underlying infrastructure, or those who want to focus their attention on development rather than DevOps and system administration.

Software as a Service (SaaS)

SaaS providers are cloud-based applications that users access on demand from the internet without needing to install or maintain the software. Examples include GitHub, Google Docs, Slack, and Adobe Creative Cloud. SaaS applications are popular among businesses and general users given that they’re often easy to adopt, accessible from any device, and have free, premium, and enterprise versions of their applications. Like PaaS, SaaS abstracts away the underlying infrastructure of the software application so that users are only exposed to the interface they interact with.

Cloud Environments

Cloud services are available as public or private resources, each of which serves different needs.

Public Cloud

The public cloud refers to cloud services (such as virtual machines, storage, or applications) offered publicly by a commercial provider to businesses and individuals. Public cloud resources are hosted on the commercial provider’s hardware, which users access through the internet. They are not always suitable for organizations in highly-regulated industries, such as healthcare or finance, as public cloud environments may not comply with industry regulations regarding customer data.

Private Cloud

The private cloud refers to cloud services that are owned and managed by the organization that uses them and available only to the organization’s employees and customers. Private clouds allow organizations to exert greater control over their computing environment and their stored data, which can be necessary for organizations in highly-regulated industries. Private clouds are sometimes seen as more secure than public clouds as they are accessed through private networks and enable the organization to directly oversee their cloud security. Public cloud providers sometimes provide their services as applications that can be installed on private clouds, allowing organizations to keep their infrastructure and data on premise while taking advantage of the public cloud’s latest innovations.

Hybrid Cloud and Multicloud

Many organizations use a hybrid cloud environment which combines public and private cloud resources to support the organization’s computing needs while maintaining compliance with industry regulation. Multicloud environments are also common, which entail the use of more than one public cloud provider (for example, combining Amazon Web Services and DigitalOcean).

Benefits of Cloud Computing

Cloud computing offers a variety of benefits to individuals, businesses, developers, and other organizations. These benefits vary according to the cloud users goals and activities.

For Business and Industry

Prior to the proliferation of cloud computing, most businesses and organizations needed to purchase and maintain the software and hardware that supported their computing activities. As cloud computing resources became available, many businesses began using them to store data, provide enterprise software, and deploy online products and services. Some of these cloud-based adoptions and innovations are industry-specific. In healthcare, many providers use cloud services that are specifically designed to store and share patient data or communicate with patients. In academia, educators and researchers use cloud-based teaching and research apps. But there are also a large number of general cloud-based tools that have been adopted across industries, such as apps for productivity, messaging, expense management, video conferencing, project management, newsletters, surveys, customer relations management, identity management, and scheduling. The rapid growth of cloud-based business apps and infrastructure shows that the cloud isn’t just changing business IT strategy: it’s a booming business in its own right.

Cloud-based technologies offer businesses several key advantages. First, they can help optimize IT costs. As businesses shift towards renting computing resources, they no longer have to invest as much in purchasing and maintaining on-premise IT infrastructure. Cloud computing is also enormously flexible, allowing businesses to rapidly scale (and only pay for) the computing resources they actually use. Cost, however, is not the only consideration that drives cloud adoption in business. Cloud-based technologies can help make internal IT processes more efficient as they can be accessed on demand by employees without needing to go through IT approval processes. Cloud-based apps can improve collaboration across a business as they allow for real-time communication and data sharing.

For Independent Developers

Computing resources that were once only affordable to large companies and organizations are now available on demand through an internet connection and at a fraction of their previous cost. In effect, independent developers can rapidly deploy and experiment with cloud-based apps. Cloud-based apps for sharing code (such as GitHub) have also made it easier for developers to build upon and collaborate on open source software projects. Additionally, cloud-based educational platforms and interactive coding tutorials have expanded access to developer education, enabling individuals without formal technical training to learn to code in their own time.

Altogether, these cloud-based computing and educational resources have helped lower the barriers to learning developer skills and deploying cloud-based apps. Formal training, company support, and massive amounts of startup capital are no longer necessary for individuals to experiment with creating and deploying apps, allowing for more individuals to participate in cloud development, compete with established industry players, and create and share apps as side projects.

For Researchers

As machine learning methods become increasingly important in scientific research, cloud computing has become essential to many scientific fields, including astronomy, physics, genomics, and artificial intelligence. The massive amount of data collected and analyzed in machine learning and other data-intensive research projects often require computing resources that scale beyond the capacity of hardware owned by an individual researcher or provisioned by the university. Cloud computing allows researchers to access (and only pay for) computing resources as their workloads require and allows for real-time collaboration with research partners across the globe. Without commercial cloud providers, a majority of academic machine learning research would be limited to individuals with access to university-provisioned, high-powered computing resources.

For Educators and Students

Cloud computing has also provided students with tools for supplementing their education and opportunities to put their technical skills into practice as they learn. Cloud-based apps for sharing, teaching, and collaborating on code and data (such as GitHub and Jupyter Notebooks) enable students to learn technical skills in a hands-on manner by studying, deploying, and contributing to open source software and research projects relevant to their field or professional aspirations. And just like independent developers, students are able to use cloud computing resources to share their code and apps with the public and reap the satisfaction of understanding the real-world application of their skills.

Students, researchers, and educators can also take advantage of cloud computing resources to support personalized academic infrastructure and practice greater control over their computing environments. Some academics prefer this approach as it lets them pick which applications they use, customize the functionality and design of these tools, and limit or prohibit the collection of data. There are also a growing number of cloud-based applications developed specifically for academic purposes that supplement or provide alternatives to traditional academic IT offerings. Voyant Tools offers students and researchers a code-free method for providing textual analysis on documents of their choosing and The HathiTrust provides access to its digital collection of millions of volumes. Reclaim Hosting, Commons in a Box, the Modern Language Humanities Commons, and Manifold offer educational, publishing, and networking tools designed specifically for academic communities.

For Community Infrastructure

Some individuals and communities choose to install and manage their own cloud-based software to serve community needs and values, customize functionality, protect user data, and have more control over their computing environment. Open source software, such as social media tools like Mastodon, video conferencing software like Jitsi, collaborative text editors like Etherpad, and web chat tools like Rocket Chat, provide alternatives to SaaS platforms that often limit user’s control, privacy, and oversight over their computing environment. While often requiring more administrative work than SaaS applications or social media platforms, some communities prefer these options given ethical concerns about the use of personal data and company practices with popular platforms and SaaS applications.

Risks, Costs, and Ethics in Cloud Computing

Though the cloud offers many benefits, it also comes with its own set of risks, costs, and ethical questions that should be considered. Some of these issues are relevant to all cloud users, while others are more applicable to businesses and organizations that use the cloud to store customers’ data:

Considerations for all cloud users:

  • Security: Cloud resources can have additional security vulnerabilities (compared to traditional on-premise data centers) given their use of APIs, cloud-based credentials, and on-demand services that make it easier for attackers to obtain unauthorized access. Find out what measures the cloud service provider takes to secure customer data from theft and other attacks and what practices or additional services customers can implement to safeguard their data.
  • Data loss: Just as with physically-owned or managed devices, cloud services can permanently lose stored data due to physical disasters, bugs, unintended syncing, user-generated errors, or other unforeseen issues. When implementing cloud services, find out what backup services the provider offers and be aware that these may not be automatically or freely provided. You may also choose to run backups yourself.
  • Data persistence: There are times when cloud users may want to ensure the deletion of personal data they’ve given to cloud service providers. However, the processes for deleting data on cloud resources and verifying that deletion can be time-consuming, complicated, or even impossible. Before you give cloud providers access to your data, find out what their policies are for deleting it in case you want to remove the data later.
  • Costs: Though the cloud can provide computing services at a fraction of the cost of owning them, expenses for cloud services can quickly ramp up with usage. When signing up for a cloud service, check the billing details to learn how services are metered and whether you can set caps or notifications when usage goes beyond your desired limits. It is also worth researching how billing details are communicated, as the billing methods of some providers are not always easy to understand.
  • Vendor lock-in: Users of proprietary cloud services may be at more risk for vendor lock in, or the condition in which it becomes difficult or impossible to change providers once computing operations are structured to fit a closed, proprietary system. Using open source cloud solutions can help alleviate this risk as its open standards make it easier to migrate computing operations from one provider to another. However, cloud users should be aware that any migration will take work, planning, and expertise.
  • Company use of data: Cloud service providers may use data to understand customer use of their product, sell or personalize ads, train machine learning algorithms, or even sell customer data to outside entities. If you have concerns about how your or your organization’s data is used, make sure to find out the service provider’s policies regarding their use of it.
  • Company ethic: Given the vast power some cloud service providers have over world affairs, cloud users may want to consider the ethics of the company that their business is supporting. Reviewing company practices with regard to topics such as data collection, advertising, hate speech, politics, misinformation, the environment, and labor may help a cloud user choose a provider that best reflects their personal values.
  • Loss of user control and visibility: The use of third-party computing resources makes it difficult or impossible for cloud users to have full visibility and control over their computing environments, which can create a variety of technical and trust concerns. Some of these technical concerns can be helped through the use of monitoring and analytics tools which allow cloud users to stay updated on their infrastructure’s performance, allowing users to respond quickly when problems arise. Trust concerns — such as those related to a company’s use of personal data — can be addressed by reviewing the company’s customer data policies and public forms of analysis about its data practices.

Additional Business Considerations:

  • Regulation: Some industries — such as healthcare, finance, and education — have strict regulations regarding the storage and use of customer data and may prohibit the storage of customer data in public clouds. Cloud users in these industries often need to adopt a hybrid cloud approach and other customized IT solutions in order to comply with regulations regarding customer data. In addition to industry regulations, organizations also need to comply with data protection and privacy laws of the location where their service is accessed. For example, cloud providers serving customers in the European Union must comply with the General Data Protection Regulation (GDPR).
  • Complexity: Migrating an organization’s computing resources to the cloud can be an extremely complex endeavor, requiring in-depth planning, governance structures, and continuous oversight to avoid incompatibilities, data loss, and cost optimization. Though the cloud can help organizations cut costs on computing infrastructure, they will still need IT experts to direct and manage infrastructure.


Cloud technologies offer a variety of opportunities to businesses, independent developers, researchers, educators, and students. By understanding the different services, models, benefits and risks offered by the cloud, users can make informed decisions about how to best take advantage of its offerings.

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Thanks for sharing at digitalocean

this was really heplful for recalling the basics, why we are using cloud

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    Thanks for sharing about Cloud Computing, really informative.

    Cloud computing is a technology that enables users to access and use computing resources over the internet, without the need to own and manage the physical infrastructure themselves. In other words, cloud computing allows users to store, manage, and process data and applications on remote servers that are owned and maintained by cloud service providers, rather than on their own local servers or computers.

    There are several key characteristics that define cloud computing:

    1. On-demand self-service: Users can easily access and provision computing resources, such as processing power, storage, and network bandwidth, without the need for human intervention from the cloud service provider.

    2. Broad network access: Cloud services can be accessed from a variety of devices and locations, as long as there is an internet connection.

    3. Resource pooling: Cloud service providers can pool computing resources across multiple users, allowing them to optimize resource utilization and improve efficiency.

    4. Rapid elasticity: Cloud computing resources can be rapidly and automatically scaled up or down to meet changing demands, without the need for human intervention.

    5. Measured service: Cloud service providers can monitor and measure resource usage, allowing users to pay only for the resources they actually consume.

    There are three main types of cloud computing services:

    1. Infrastructure-as-a-Service (IaaS): This provides users with access to raw computing resources, such as virtual machines, storage, and network resources, on a pay-per-use basis.

    2. Platform-as-a-Service (PaaS): This provides users with a complete development and deployment environment, including development tools, programming languages, databases, and operating systems.

    3. Software-as-a-Service (SaaS): This provides users with access to fully functional software applications, such as email, productivity tools, and CRM systems, that are hosted and managed by the cloud service provider.

    Cloud computing offers many benefits, including increased flexibility, scalability, and cost savings. It allows organizations to quickly and easily provision computing resources as needed, without the need for large upfront investments in physical infrastructure. However, there are also security and privacy concerns associated with cloud computing, and organizations must take steps to ensure that their data and applications are properly protected.

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