What is RSS?

RSS is an acronym for "Really Simple Syndication" or "Rich Site Summary."
An RSS feed is an online file formatted in XML, containing headlines and descriptions of Website updates and brief information about other news.

How can I read them?

You can use any RSS Feed reader to collect and monitor your favorite feeds. There are several free or inexpensive readers available, which allow you to read feeds from multiple sources. Many Web browsers can display RSS feeds, and Web sites such as Google and Yahoo! offer RSS features.