RDF Site Summary (RSS) files, based on XML, provide an open method of syndicating and aggregating Web content.
A RSS Aggregator or News Reader enables you to quickly read and gather information from hundreds of web sites – without having to visit them. Don’t waste any more time checking your favorite web sites for updates.
RSS Feeds are frequently marked with badges like this 
or just links marked “rss”, “atom” or “syndicate”.
Most major news organizations have then (like CBC, Yahoo! News, CNN or Washington Post) as well as many Blogs and other (even Retail) sites to make it easier to find when something is new.
Category:RSS