Cryptocurrency is a decentralized digital currency, it can be used for the same thing as any other digital currency, the difference being that you can use it without relying on a centralized authority like a bank or similar financial institutions.

Yes you can buy pizzas with it, although that’s less common nowadays because there are more practical ways to pay for that and you probably don’t mind the bank and government to know you buy pizzas.

I thought what made money money was everyone agreed it was valuable and was willing to exchange it for goods and services directly. I don’t see that with crypto.

You don’t? If I were to offer you 1BTC for your mouse, would you accept it? If you say no you’re stupid, if you say yes you confirmed you see it as valuable and are willing to exchange it for goods directly.