What is an RSS feed?

A non-technical way of explaining RSS is that it's a way of making frequently updated content, such as weblog posts, available to other people, in an easy to understand and use format. The nice thing about RSS feeds is that anyone can use them - even people that don't have websites of their own. For instance, let's say you have a favorite weblog that you read on a regular basis. Rather than bookmarking this site and constantly checking it for updates, you can use an application called a news aggregator that will collect RSS feeds from around the web and check them for you on a regular basis. When the site gets updated, your aggregator will let you know and you can then launch the site in your web browser. As more and more sites syndicate their content with RSS, aggregators really change how you use the web.