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Users-MacBook-Air:~ user$ apt-get update
-bash: apt-get: command not found
You're need first to connect to your "server machine" e.g. droplet. Read this.
If you want use human-oriented package & dependency manager on OS X there is no alternative but http://brew.sh/
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You're on your macbook, not your droplet.
what is droplet?
@navalkishoregr A Droplet is what DigitalOcean calls a VPS, much like how some refer to them as Cloud Servers, Cloud Instances etc.
As for the apt-get command, this is native to Ubuntu & Debian Operating Systems. OSX, Apples' OS, using the installer command, IIRC.