Is kraken a crypto wallet?

Complete newbie here. Is kraken a crypto wallet or do I need another app for that?

A bit of background as my post need to be a certain lenght;

I've invested in bitcoin and ethereum on Kraken. Idk anything about crypto, but I started by investing in bitcoin, because I wanted to use it at a website that gave discount and I wanted the transaction to be anonymous.

I figured BTC was the original crypto currency and it probably wouldn't crash. (no idea tbh) After a while BTC gained some and my portfolio grew a bit so I figured I'd try investing in ethereum as well because I saw it had generally risen over time. It too has gained a bit since then. So far, so good.

I'd like to use my crypto to buy something. Can I do that via. kraken (like at the check out on a website) or do I need another app or program that acts like a so called wallet? In that case, what app should I choose? I do it all via. mobile sorry if that's a really obvious question, I've tried a quick search and didn't exactly get the answer I was looking for.