title: Can someone explain to me in simple terms what Passenger is?
body: <p>I was researching to set up my linux (ubuntu) vps for rails. And almost all of the guides I've read tells me to install passenger. But none of the guides explain what it is (atleast not in simple terms). So I was wondering if someone could explain in simple terms what exactly passenger is.</p>
  
  <p>I'm trying to set up my VPS so I can easily push code to it from git, and deploy my app (Easy as heroku?) Any suggestions?</p>