What is this RSS button?

RSS (most commonly said to be an acronym for 'Really Simple Syndication') is an XML-based system that allows users to subscribe to their favorite websites. Using RSS, webmasters can put their content into a standardized format, which can be viewed and organized through RSS-aware software or automatically conveyed as new content on another website. Web Feeds benefit readers who want to subscribe to timely updates from favored websites or to aggregate feeds from many sites into one place. RSS feeds can be read using software called an "RSS reader", "feed reader", or "aggregator", which can be web-based, desktop-based, or mobile-device-based.

Google reader is recommended to add RSS items
Please note:

• A valid User ID and password for Google are required
• Click the 'Add subscription' button and paste a URL to add a feed
  eg. http://datasearch.uts.edu.au/firn/news/rss.cfm
• Item will then be shown in the Google reader