Bitcoin futures ETF’s ( Exchange Traded Fund) invest in contracts used to appreciate on future prices for bitcoins. They can be purchased and sold like stock and don’t require buyers to hold an account at a cryptocurrency exchange or have a crypto wallet.
Futures trading is options trading.
Futures are derivative financial contracts that obligate the parties to transact an asset at a predetermined future date and price. (Investopedia)
Learn more about finance terms at Investopedia