In trading, the buyer of the option pays a certain amount of premium to the seller, and then obtains this right, that is, the right to sell or purchase a certain amount of the subject matter (commodities, securities or futures contracts) at a certain price (exercise price) within a certain time frame.
When the buyer of an option exercises its rights, the seller must perform its obligations in accordance with the provisions of the option contract. On the contrary, the buyer can waive the right to exercise. At this time, the buyer only loses the royalties, while the seller earns the royalties.
In short, the buyer of an option has the right to exercise the option and has no obligation to exercise; while the seller of an option only fulfils the obligation of the option.
Please keep in mind that trading is risky, and investors should be cautious.