Often called "Really Simple Syndication" an RSS feed allows WSM users to automatically syndicate their news or blog posts to their customers RSS readers. Every site has an RSS feed, and it is valuable to WSM users to encourage customers to sign up for their RSS feed.
Every site has an RSS Feed. The URL for the RSS Feed will always follow this example yoursite.com/news.rss
Encouraging customers to sign up for RSS Feeds allows customers to automatically recieive blog post updates delivered directly to the RSS Reader of their choosing.