RSS stands for "Rich Site Summary," "RDF Site Summary," or "Really Simple Syndication," according to different sources. Whatever the initials stand for, RSS is a format based on XML (eXtensible Markup Language) that is increasingly popular for gathering and distributing Web content such as news headlines. An RSS feed is simply a file that conforms to RSS format. Many sites now publish RSS news feeds, including major news organizations such as Reuters and the Associated Press.
If you want to receive news from RSS feeds, you need a news aggregator -- also called a "feed reader" or "RSS aggregator." A news aggregator can be a program or an extension to your Web browser or email program, and there are many of them available. A news aggregator makes it much easier for you to follow the news that interests you. It automatically displays the updates published by your selected news sources so that you don't have to check each source's Web site separately.