From Carleton Moodle Docs
RSS (really simple syndication) feeds in Moodle enable people to stay up to date with forum posts, glossary entries and other events within Moodle.
A Remote RSS feeds block enables RSS feeds (either from within Moodle or from an external site) to be displayed on pages in Moodle.
- RSS feeds FAQ
- BBC: An introduction to RSS Feed (Really Simple Syndication)
- Wikipedia "RSS (file format)"