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Options are conditional derivative contracts that allow buyers of the contracts (option holders) to buy or sell a security at a chosen price. Option buyers are charged an amount called a "premium" by the sellers for such a right. Should market prices be unfavorable for option holders, they will let the option expire worthless, thus ensuring the losses are not higher than the premium. In contrast, option sellers (option writers) assume greater risk than the option buyers, which is why they demand this premium. Options are divided into "call" and "put" options. With a call option, the buyer of the contract purchases the right to buy the underlying asset in the future at a predetermined price, called exercise price or strike price. With a put option, the buyer acquires the right to sell the underlying asset in the future at the predetermined price.