Flat fee

Flat fee means that you pay the same amount of money no matter how much of that thing you use or how long you use it for. So, let's say you want to buy some cookies. You can buy cookies for $1 each, or you can buy a flat fee of $10 for as many cookies as you want. That means you can have one cookie, ten cookies, or even 100 cookies for the same price of $10. It's like getting a bundle deal, where you pay one set price for everything instead of paying individually for each thing you use or buy.