The market is uncertain and there are trading risks. Senior players have an idea to lengthen the timeline of spot trading, now set the future trading price, and then trade at the trading price. At the beginning, this game was just launched, and it was futures trading, so it was called "forward".

Everything is difficult at the beginning, that is, the "forward" agreement in the market is not unified and personalized, and the goods, quantities and prices outside the two are difficult to transfer. Generally, both parties know each other's reputation, and the transaction is usually delivered in kind at the end, and there is no fixed trading place. This is "forward" (forward 1.0 version).

Later, it developed into standardization and standardization, and it became Forward 2.0. Of course, this is called trouble, a new name "future" (we call it futures), which means "future". Compared with 1.0 version, version 2.0 is more compatible, and the protocol format and standard are unified. The quantity is calculated by "lots", and the transaction amount of each lot is limited, which is convenient for circulation and transfer. There is a special exchange transaction; As an intermediary, the exchange collects the trading margin, so it is easy to find the counterparty; Generally, there is no physical delivery at the end of the transaction, and the reverse transaction is carried out before the expiration to offset and avoid delivery.

The answer of the textbook version depends on other answers, and the above is only for vernacular understanding.