& 3 others (via)
RSS is a method of distributing links to content in your web site that you'd like others to use. In other words, it's a mechanism to "syndicate" your content.
To understand syndication, consider the "real world" situation where artist Scott Adams draws a daily Dilbert cartoon. The cartoon is made available to any newspaper that cares to run it, in exchange for a fee -- and 2,000 papers in 65 countries do so.
Unlike Scott Adams, syndication of web content via RSS is unlikely to make you rich. However, it can be an easy way to draw attention to your material, bringing you some traffic and perhaps a little net fame, depending on how good your information is.