RSS for beginners
Watch this excellent short video for a simple explanation of RSS (Really Simple Syndication).
RSS provides the facility for both individuals and other websites to use content from the website publishing the RSS feed. Individauls can read the content using news reader software, Other websites can also update their own content with items listed in an RSS feed. Other popular formats like Atom also allow websites to publish news feeds in a similar fashion.
The combination of writing useful content and publishing that content via RSS or Atom etc. can be a very effective way of marketing a website and generating traffic to the website.