What the heck is Tinder?

So I keep hearing about this thing called Tinder. It's everywhere! I'm not asking because I want to join. I'm just curious...
Is it a dating site or a place to find people to casually hook up with? Or is it both? What is Tinder? Do you have a Tinder? What do you use it for? Am I asking too many pointless questions? Probably.
What the heck is Tinder?
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