Here’s wikipedia’s description!
This what the Nature Publishing Group says.
Many scientific journals, web sites, blogs etc. provide “news feeds” or “live feeds” of the articles on their site.
It’s a way of keeping up to date with changes on the site without going to all the trouble of logging on to the site and manually checking.
Some web browsers have this feature, I use NetNewsWire on the Mac.
It’s very easy to add sites to your reader and then it’s like having a personalized newspaper.
This web site and blog can be read from RSS feeds.
Give it a try.