A contract that gives the owner (buyer) the right, but not the obligation, to buy or sell a particular asset (the
underlying security, i.e. stock or index) at a fixed price (the
strike price) for a specific period of time (until it
expires). The contract also obligates the
writer (seller) to meet the terms of delivery of the asset if the contract right is
exercised by the owner. The amount the buyer pays the seller for the option is called the option
premium.