It’s All About Sharing Content
One of the basic tenets behind the internet is sharing data. Initially, that was primarily done with HTML. But with the rise of web applications, sometimes plain HTML just won’t do. That’s where API’s and feeds come in. An application with a proper API allows other applications to query it for content and get that content back in a variety of formats, be it XML, JSON, or HTML. Feeds on the other hand are a one-way distribution of data, usually in XML format.