If you want to sell crypto coins quickly, getting dollars is hard. You have to go through banks, or trust that the "USD" in your crypto exchange account is real

If you want to sell crypto coins quickly, getting dollars is hard. You have to go through banks, or trust that the "USD" in your crypto exchange account is really there. Getting crypto tokens out of an exchange is pretty easy, but you're just jumping from one volatile asset to another. So someone had the idea that you could create a coin that would retain its value but you could easily swap for crypto coins.