A put option (sometimes simply called a "put") is a financial contract between two parties, the buyer and the writer (seller) of the option. The put allows the buyer the right but not the obligation to sell a commodity or financial instrument (the underlying instrument) to the writer (seller) of the option at a certain time for a certain price (the strike price). The writer (seller) has the obligation to purchase the underlying asset at that strike price, if the buyer exercises the option.

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