RSS stands for Real Simple Sindication. It refers to a type of web feed format which allows users to subscribe to digital content and then provide the latest content from those digital mediums. Users subscribe to content, such a blog or podcast, by entering a link to the content's hosting website into the RSS reader. The aggregate reader then frequently scans the hosting website to check for any updates. If there is new material available, the RSS aggregator collects it and presents it to the reader. RSS feeds are important as a means to centralize information on the web for specific users, allowing them to receive more information in a far more convenient manner.
RSS is significant because it is part of the larger movement of Web 2.0 insofar as it enables personalization of the internet.