RSS, or Really Simple Syndication, is one of the new methods of web site promotion. It is the structured data format used originally to syndicate blogs and news, but is now spreading quickly to use by millions of web sites already. Its use is growing rapidly.
When your site uses RSS, it publishes a small file containing the RSS feed for your site. The file is in a format easily readable by computers, but not so easily readable by humans. With the RSS feed, other software around the web can easily retrieve RSS files and know what new articles have been published. For example people can use RSS feed aggregator software to quickly scan large numbers of RSS feeds, or they might go to the new types of search engines that specialize in indexing the material published through RSS feeds.