I found this on the net about how RSS feeds work:
At its simplest, this file contains a main URL and a set of items representing links published from the website in question. Each of these items consists of a title, a link to that content on the site and a brief description.
An RSS reader/aggregator links to the RSS file on the site and downloads it, rendering each of the items as a separate headline and synopsis of that article or content, complete with a link. Most RSS readers will continually scan each RSS feed they have linked to for updates, then inform the user when new content is found.