RSS Feed : RSS stands for Rich Site Summary or Really Simple Syndication. RSS feeds are used to delivery your blog content updates to your RSS feed readers automatically.
Need to add Rss feed button to blogs :
RSS feed is the best method to let the visitors to subscribe your blog. It is also one of the best method to increase your blog traffic. After your blog visitors subscribe your blog with RSS feed, then when ever you update your blog, that updated information will deliver to your blog visitors.