A Bitcoin future is basically a bet. You bet on the price of Bitcoin in the future. You can bet that prices will go up or down. If you're right, you gain money. If you're wrong, you lose money.
I know this is an over-simplification, but that's basically what it is. Most futures pay out in whatever you are betting on. Bitcoin futures pay out in USD. So, they do not affect the supply and demand of Bitcoin. It's purely speculative.
A Bitcoin future is basically a bet. You bet on the price of Bitcoin in the future. You can bet that prices will go up or down. If you're right, you gain money. If you're wrong, you lose money.
I know this is an over-simplification, but that's basically what it is. Most futures pay out in whatever you are betting on. Bitcoin futures pay out in USD. So, they do not affect the supply and demand of Bitcoin. It's purely speculative.
I have written a post about what a futures contract is: https://steemit.com/bitcoin/@datascience/introduction-to-bitcoin-futures