Web API, что про него известно?

http://metanit.com/sharp/mvc/12.1.php

contains the MVC features such as routing, controllers, action results, filter, model binders, IOC container or dependency injection.
http://www.dotnettricks.com/learn/webapi/what-is-web-api-and-why-to-use-it-

it works with HTTP verbs GET,POST,PUT and DELETE.
Responses have an Accept header and HTTP status code.
If we need a Web Service and don’t need SOAP, then ASP.Net Web API is best choice.