Django comes with a high-level syndication-feed-generating framework that makes creating RSS and Atom feeds easy. RSS and Atom are both XML-based formats you can use to provide automatically updating feeds of your site's content. Read more about RSS here (http://www.whatisrss.com/), and get information on Atom here (http://www.atomenabled.org/).
To create any syndication feed, all you have to do is write a short Python class. You can create as many feeds as you want. Django also comes with a lower-level feed-generating API. Use this if you want to generate feeds outside of a web context, or in some other lower-level way.