RSS is a standard protocol for subscribing to "feeds" that will let you know when the service you've subscribed to has been updated.

To use RSS feeds, you need to be using a feed reader, or use the "live bookmark" function available in recent versions of most web browsers.

When you click on the feed links on this page (or elsewhere, as indicated by the orange feed icon) your browser will attempt to subscribe to the feed using whatever tool is set as the default RSS reader on your computer.