Wikipeida sums it up best, “RSS is a family of web feed formats used to publish frequently updated works—such as blog entries, news headlines, audio, and video—in a standardized format.” In other words, using the right software, you can subscribe to your favorite sites and be notified when there is an update.
Most modern browsers now support RSS without requiring additional software. Simply click the “Subscribe” button on the preceding page to see how your browser handles the feed.
As an alternative, many people have found online RSS readers to be very helpful. Two such services include Google Reader and Bloglines. If you’d prefer to use dedicated software for your feeds, a list of commonly used RSS Aggregators can be found at this link.
For more information on RSS feeds, we highly recommend the video tutorial RSS In Plain English. You can also learn more at Wikipeida.