Before starting out and decide if this "thing" is useful, we need to get some meaning and grab some light, let us take a look: RSS stands for “Really Simple Syndication” or “Rich Site Summery”, Does it tell you something interesting ? I doubt it, then here we got nothing...
And guess what?... Don't Panic... RSS is a new format to display information coming from content-rich-sites (at least this is what you hear), truth is, they can be any kind of sites that You decide to walk around.
But here is most important thing... it doesn't matter what RSS is, unanswered questions you have in your mind could be : how can I be sure this new technology is valuable for me, end user?
Actually only way to know is to make available this information installing a feed reader, it works like a browser where you can choose content to look at: Go to your preferred search engine and key in "feed reader", get a free one, give it a try, who knows it can be new way you can get information from IT world.
Let me explain in a few words how this works.
The publisher, marketer, webmaster, or any group or individual that want to communicate with you using this technology create a channel or feed in their web site, when feed is on and you are subscribed to that specific channel your computer detects modifications, and get updated data, this is feed reader work that previously you installed in your computer, feed reader is a RSS aware program that reacts to information changes.
I will tell You something extra on feed reader technology RSS aggregators (other name for feed readers) are special browsers that display content to final users, most common are ones you can install in your desktop and ones that you integrate in your website.