RSS stands for "Really Simple Syndication". It's a format for distributing and gathering content from sources across the Web, including newspapers, magazines, and blogs. Web publishers use RSS to easily create and distribute news feeds that include links, headlines, and summaries.
There are many stand-alone software programs used to collect, update, and display RSS feeds. Many of these are free. Some work from within your web browser or email client, while other work on your desktop. If you publish a blog, you may be interested in incorporating RSS feeds into your weblog to share with your readers. News aggregators (also called news readers) download and display RSS feeds for you. Many free and commercial news aggregators are available for download.
You can find a variety of RSS news aggregators in the Web. Many aggregators are separate, stand-alone programs; other services let you add RSS feeds to a web page.