"If you have at least a basic understanding of content syndication and the RSS 2.0 format specification, as well as the Atom 1.0 format specification, then you're ready to implement a news syndication system using one or the other or both, and this article is intended to be a handy reference for you.
"RSS and Atom are similar XML-based document formats that describe lists of related information known as feeds. These feeds are composed of a number of items, each with an extensible set of attached metadata; for example, each item has a title. The primary purpose of these feeds is the syndication of Web content such as Weblogs or news headlines to Web sites and directly to user agents..."