Everything related to REST API can be found at this page below

[http://wiki.developerforce.com/page/REST_API][1]


![enter image description here][2]


  [1]: http://wiki.developerforce.com/page/REST_API
  [2]: https://i.sstatic.net/HD0Ql.png


  >1)Supports both XML and JSON format

 > 2)Preferred for mobile and web apps since JSON being Lighter the app runs smoother and faster

 > 3)Since both REST and OAuth rely strongly on HTTP/S standards - it makes it very easy to find existing libraries to communicate with the API's for nearly any language