Re: RSS Feed ?
RSS feeds (as Namaan explained) is used to disperse news, articles and other updates that people publish. This is another standard like email where you can use an email client and then tap into various email servers to download items to one central location so you can read, search (“aggregate”) all your electronic correspondence.
With RSS feeds (or atom) you get various pieces of broadcasts in one location. For example I have a folder where all the feeds from sale items for the day/week are collected, so I can do a search for an item to see if I can find discounts for it. Another example would be to get updates on a certain topic in news.
Google has an online client for these feeds called the Google Reader where you can put in your desired streams and check them out. (http://reader.google.com)