Thanks to Joan Vinall-Cox, a friend in my personal social network here, I found a video that explains what an RSS is, what is it good for, why do we need them and how to use them, in a clear and even funny way. Here it is:
Here's the link to the original video.
Basically RSS, Atom, XML, and any of those organge square buttons (
) we see everywhere help us by keeping us informed of the changes in any web page, for example news in a blog or a newspaper. No more need to check the page again and again to seek for anything new. We can get the information we need from different sources, join them in an aggregator and keep being informed of whatever we need in a really fast and simple way. This is a way to fight information overdose. Here, in Eduspaces.net and Elgg in general, we have an RSS and Atom aggregator in what is called "Your resources". We can even get news from our own external blog and let it appear in our blog here automatically. We have such a good Web 2.0 integrated tool here! 
