RSS is a web feed format used to publish frequently updated content. An RSS document, called a feed, contains either a summary of content from a web site or the full text. RSS makes it possible for people to keep up with their favourite web sites automatically, instead of checking them manually.

RSS content can be read using a feed reader or an aggregator. The user can subscribe to a feed by entering the feed's link into the feed reader. The feed reader checks the user's subscribed feeds regularly for new content, downloading all updates that it finds.