RSS (RDF Site Summary) is a format for delivering regularly changing web content. Many news-related sites, weblogs and other online publishers syndicate their content as an RSS Feed to whoever wants it.RDF Site Summary (RSS) files, based on XML, provide an open method of syndicating and aggregating Web content.
Using RSS files, you can create a data feed that supplies headlines, links, and article summaries from your Web site. These files describe a channel of information that can include a logo, a site link, an input box, and multiple "news items." Other sites can incorporate your information into their pages automatically.
You can also use RSS feeds from other sites to provide your site with current news headlines. These techniques let you draw more visitors to your site and also provide them with up-to-date information.