RSS or Rich Site Summary is type of web feed. This format is used to deliver regularly changing web content to users. User can keep track of several different websites in a single news aggregator. Automatically, the news aggregator will check the RSS feed for additional content, which allow the content to be automatically passed from website to user or from website to website. This is called web syndication. By subscribing to RSS, users can avoid checking the website again and again for any new content.