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It's a way to tell stories in a fantasy (-ish, depending on what rules you've laid out for the universe) setting.
It's a lot of fun with friends, but you can still use the rules to write a story by yourself, if you're so inclined.
You can also make up your own rules if you like.
It's basically just collaborative storytelling (barring if your single player-ing it, then it's just story writing).
You could defs jump in and give it a try. There's a lot of stuff to read at first, but the more familiar you get with it, the easier it goes.
This is how I describe it as well.
I usually tell people it's like collab storytelling around the campfire, the rules are used as needed to create risk and tension, but aren't something you need to know right away