RSS stands for really simple syndication (or rich site summary). It is the tool that enables instant sharing, notification and syndication of new and / or updated materials. An RSS feed is an xml file on the web that briefly describes updates to such elements as blogs, podcasts and wikis.
RSS feeds from three blogs are displayed in the right column ->
Google's FeedBurner is an advanced RSS generator.
Subscribe to feeds via browser or any of many aggregators.