What is RSS?

RSS (Really Simple Syndication) is an XML-based format for sharing and distributing Web content, such as news headlines. Using an RSS reader, you can view data feeds from various news sources, such as CNN.com, including headlines, summaries, links to full stories.
http://www.cnn.com/services/rss/

RSS/News Aggregators:
RSS/News Aggregators (also called Readers) will download and display RSS feeds for you. A number of free and commercial News Aggregators are available for download.

Many aggregators are separate, "stand-alone" programs; other services will let you add RSS feeds to a Web page. Yahoo! users can add RSS feeds to your My Yahoo! page; to make this easier, you can click on the "Add to My Yahoo!" button to the right of each link above.