is US$1.20, then the option has an intrinsic value of US$0.20. This is because that call option allows the owner to buy the underlying stock at a price of 1.00, which they could then sell at its current market value of 1.20. Since this gives them a profit of 0.20, that is the current ("intrinsic") value of the option.

The market price of an option is generally different from this intrinsic value, due to uncertainty: as alluded to, it is based on the current market value