RSS stands for Really Simple
Syndication. Web developers use RSS to share their updated content without
requiring users to return to their site. RSS creates a concise summary for
readers to quickly decide whether to keep reading or not. This works much like
standard news sites, but now you have more control over the content you receive
and the ability to get many sources of content on the same screen.

See my article on the basics of RSS and Podcasting at the Teaming 4 Technology page or my article on creating RSS and Podcasting Content. Both of these articles are geared towards nonprofits but applicable to anyone