[SimpleSAMLphp](https://simplesamlphp.org/) is an open-source PHP authentication application that provides support for [SAML 2.0](http://docs.oasis-open.org/security/saml/Post2.0/sstc-saml-tech-overview-2.0.html). SAML (Security Assertion Markup Language) is a secure XML-based communication mechanism for exchanging authentication and authorization data. In this tutorial you'll install SimpleSAMLphp and configure it to use a MySQL database as an authentication source. Choose your operating system below to get started.