A detailed explanation about RSS feeds can be found on Wikipedia .
What is an RSS Feed?
RSS (an abbreviation for Really Simple Syndication) 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. An RSS document (which is called a "feed", "web feed", or "channel") includes full or summarized text, plus metadata such as publishing dates and authorship.
Web feeds benefit publishers by letting them syndicate content automatically. They benefit readers who want to subscribe to timely updates from favored websites or to aggregate feeds from many sites into one place.
How do I subscribe?
RSS feeds can be read using software called an "RSS reader", "feed reader", or "aggregator", which can be web-based, desktop-based, or mobile-device-based. A standardized XML file format allows the information to be published once and viewed by many different programs. The user subscribes to a feed by entering the feed's URL into the reader, or by clicking an RSS link in a browser that initiates the subscription process.
The RSS reader checks the user's subscribed feeds regularly for new news articles, downloads any updates that it finds, and provides a user interface to monitor and read the feeds.
If you use iTunes to subscribe to RSS feeds then simply press the ‘Subsribe with iTunes' link on the right hand side of the podcast page. Your browser will notify you that you are about to launch an application. Click ‘Launch Application' to open iTunes and subscribe to the podcast. If you don't have iTunes then you will have to install it before you subscribe in this way.
If you have a Google profile then you can add an RSS feed to either your Google homepage or your Google reader. To do this, simply press the ‘Google' button on the right hand side of the podcast page.
If you have a yahoo profile then you can add an RSS feed to your myYahoo homepage. To do this simply press the ‘myYahoo' button on the right hand side of the podcast page.