...and how do you use it?
RSS is used to get updates and links when there are new posts. You need an RSS reader or notifier (a google search will give you some options) or you can create an RSS bookmark folder in most browsers that updates with the latest links. For example if you were to subscribe to an RSS feed of my Instructables your RSS reader will update you when I post new Instructables and provide a link.
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here is a great guide on what is RSS and how to use it. This is for our friends who are just starting out in tech world. hope i was helpful.