The RSS feed is the page where your original page is standing but than in a really simple form. You can ask people to subscribe on the RSS so everytime you refresh your content or put another article on your site, they will see that on the RSS feed. You can also put the RSS feed of your site on pages like squidoo and hubpages so that you will get more backlinks.
here is complete information about RSS you guys are asking stupid question if you want to lean about RSS then simple thing is go to google.com and type there you can easily find.
RSS feed means a short form of the stories or posts published in your website, published in xml format. It can be read in RSS reader software like Google Reader or FeedDemon.
fast explain :it make user not have to visit your web or blog daily,... they just got your content on their inbox email....
Let me explane you this was... If some one subscribe to your site with RSS he will get notification about site update (new posts) without coming to your site.