Thanks to http://www.WhatIsRSS.com/ for this info.
RSS Primer: One Page Quick Introduction to RSS
What is RSS?
RSS (Rich Site Summary) is a format for delivering regularly changing web content. Many news-related sites, weblogs and other online publishers syndicate their content as an RSS Feed to whoever wants it.
Why RSS? Benefits and Reasons for using RSS
RSS solves a problem for people who regularly use the web. It allows you to easily stay informed by retrieving the latest content from the sites you are interested in. You save time by not needing to visit each site individually. You ensure your privacy, by not needing to join each site's email newsletter. The number of sites offering RSS feeds is growing rapidly and includes big names like Yahoo News.
What do I need to do to read an RSS Feed? RSS Feed Readers and News Aggregators
Feed Reader or News Aggregator software allow you to grab the RSS feeds from various sites and display them for you to read and use.
A variety of RSS Readers are available for different platforms. Some popular feed readers include Amphetadesk (Windows, Linux, Mac), FeedReader (Windows), and NewsGator (Windows - integrates with Outlook). There are also a number of web-based feed readers available. My Yahoo, Bloglines, and Google Reader are popular web-based feed readers.
Once you have your Feed Reader, it is a matter of finding sites that syndicate content and adding their RSS feed to the list of feeds your Feed Reader checks. Many sites display a small icon with the acronyms RSS, XML, or RDF to let you know a feed is available.
The four things you need to know about RSS
by Seth Godin
1.RSS is a stream of updated information. It comes from a blog or a website or some other content application and allows an RSS Reader to know an update has occurred.
2.When the reader sees an update, it grabs the headline or the headline and some of the content, or the headline and ALL of the content and displays it for you.
3.This means that once you set up a feed (more on that in a bit), you've got a direct, permanent, updated connection to a source of content. No more surfing!
4.So, this kills email marketing and it makes it easy for you to have anticipated, personal and relevant communications to (or with) whatever content sources--like companies or people or calendars or databases--you want.