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.

los RSS

To use RSS, any Web site that wants to "publish" some of its content, such as news headlines or stories, creates a description of the content and specifically where the content is on its site in the form of an RSS document. The publishing site then registers its RSS document with one of several existing directories of RSS publishers. Some current directories of RSS files include Meerkat, GropSoup, NewsIsFree, UserLand, and XML Tree; these sites are sometimes known as content aggregators. RSS browsers include Headline Viewer and Novobot. Internet Explorer 7 and Mozilla's Firefox 2.0 both include integrated RSS subscription functions. Users can see whether a Web site has RSS feeds by looking in the far right of the address field in the Web browser, to the right of the URL, and clicking on the universal RSS feed icon, shown on the right.