Originally published at: http://www.sitepoint.com/developers-guide-to-feeds-in-wordpress/
A feed is a data format used for providing users with frequently updated content. Feed readers are used to read a feed, thereby allowing users to subscribe to it. Making a collection of feeds accessible in one spot is known as aggregation, which is performed by a feed aggregator.
In this tutorial I’ll show you the different kinds of feed formats provided by WordPress and how to access them, with a focus on customizing them programmatically.
Feed Formats Supported by WordPress
WordPress supports four popular feed formats: RDF, RSS 0.92, RSS 2.0 and Atom. RSS 2.0 is the most popular feed format and is supported by almost every feed reader.
Continue reading this article on SitePoint