Guild Wars 2

So far I’ve leveled, played a bit of sPvP, tPvP, and 2 dungeons. So now I’m starting to wonder about the rest of the game. My questions are as follows:
What are Fractals?
Who can get/do Fractals?
What is the point of getting them/doing them?

Even if you tell me I missed a post with explanations… I just want answers lol.
Thanks in advance to all who help.

https://www.guildwars2.com/en/news/leah-rivera-on-the-new-fractals-of-the-mist-dungeon/

Reiven.2543:

https://www.guildwars2.com/en/news/leah-rivera-on-the-new-fractals-of-the-mist-dungeon/

Thanks a lot. I have been playing the game more than searching for this info. I appreciate it.