Dear friend, RSS means Really Simple Syndication. for this you just create RSS file in xml format and place here main link <?xml version="1.0"?> <rss version="2.0"> <channel> </channel> between channel there are title description link for main domain and for other URL you can add Item, Tittle, description, Link and make xml format and upload at root directory of your website server. And place a link at footer in your websites. The use of RSS is simple updation about your website for other pages where your rss feed url are placed.
RSS is like subscribing to your favorite magazine. You can subscribe to RSS feeds from sites like Engadget, BBC, CNN, etc.