For the writer (seller) of a call option, it represents an obligation to sell the underlying security at the strike price if the option is exercised. The call option writer is paid a premium for taking on the risk associated with the obligation. For stock options, each contract covers 100 shares. The call buyer has the right to buy a stock at the strike price for a set amount of time. For that right, the call buyer pays a premium. If the price of the underlying moves above the strike price, the option will be worth money (will have intrinsic value). A call option, often simply labeled a "call", is a contract, between the buyer and the seller of the call option, to exchange a security at a set price. The buyer of the call option has the right, but not the obligation, to buy an agreed quantity of a particular commodity or financial instrument from the seller of the option at a certain time for a certain price. The seller is obligated to sell the commodity or financial instrument to the buyer if the buyer so decides. The buyer pays a fee for t