You’ve seen the link to an RSS feed like this one before, right?
If it weren’t for RSS feeds there’s no way to know when your favorite websites are updated without going and checking each one. My tool of choice for tracking all the sites I follow is Google Reader. I give Google Reader the link to the RSS feed of the website I wish to follow for new content and Google Reader gives me the new information whenever it’s available. All I have to do is log in to my Google Reader account when I wish to see what’s new.
Here are a couple of resources that will help you understand RSS feeds.