Futures gold prices in the market are all related to time, such as three-month futures gold prices, six-month futures gold prices and so on. Futures prices are also related to spot prices. For example, if the price of gold rises now, the price of futures may also rise, unless many people expect the price of gold to fall sharply in the future.
In short, the futures gold price reflects the gold price after a period of time.
More specifically, let me give you an example:
At present, the spot price of gold in the market is US$ 800 per ounce. I expect the price of gold will rise in the future, so I bought a three-month gold futures with a delivery price of US$ 805 per ounce in the futures exchange. By the end of three months, the price of gold in the spot market is US$ 850, so I can still buy gold at the agreed price of US$ 805 with others, and then I can buy it at the spot market for US$ 855.
Note: In practice, spot delivery is rare and generally closed. This is just to illustrate the principle of futures.