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That is buy call option, believing that the price of the underlying asset will rise to a certain extent in the future, and it is expected that the price will rise more than the exercise price on the expiration date of the option. The longer the time to maturity and the higher the degree within the price, the higher the option price.
Maximum profit: if the underlying asset rises indefinitely, the profit will be infinite
Maximum loss: the maturity of the underlying asset is lower than the exercise price, and all the premiums are lost