What is RSS feed?

Elenyae got it right for SEO.. it means like certain keywords which are being used to index say, an article or something on search engines. The prominent keywords used will be useful into getting those articles or blogs and sites noticed. RSS feed is like a summary link of your posts and stuff like that. It is like a back-link, and someone can look at a glance of stuff you have just by looking at a site's RSS feed. Hope this helps.