que es un RSS

RSS is an XML-based vocabulary for distributing Web content in opt-in feeds. Feeds allow the user to have new content delivered to a computer or mobile device as soon as it is published. An RSS aggregator or RSS reader allows the user to see summaries of all their feeds in one place. Instead of visiting multiple Web pages to check for new content, the user can look at the summaries and choose which sites to visit for the full versions.