Why is my computer shutting itself off?

I noticed earlier this afternoon that my macbook was making a loud noise, I assumed it was one of the fans turning on as my laptop usually runs hot so I thought nothing of it. I had Firefox open, messenger, and decided to play a game. I loaded up the game just fine and in the middle of playing said game my laptop shut itself off. I decided to leave it off and let it cool down for a while before turning it back on and attempting to play the game again. Once it cooled off I turned it back on and about 5-10 minutes after starting my game it shut itself off again. Does anyone know what could be causing it to shut itself off? Is there a fix for it?