Taking the Wikipedia definition “RSS is a family of web feed formats used to publish frequently updated digital content, such as blogs, news feeds or podcasts.”

Using an aggregator system such as Bloglines, a free service, a user can chose the blogs, news sites or publishers of podcasts that are of interest, save the URL and receive regular upadate when the contents of the site is updated.

RSS feeds encourage the flow of information, and as opposed to hyperlinks, the information is delivered to us, rather than us having to click the link to take us to the information. RSS feeds are particulary useful for subscribing to a blog or special interest, as you recieve the new updates as and when the author posts.