A call option gives the holder the right, but not the obligation, to purchase 100 shares of a particular underlying stock at a specified strike price on the option's expiration date.

A security that gives the owner the right to buy 100 shares of a stock or an index at a certain price by a certain date.

An option contract in which the holder has the right (but not the obligation) to buy the underlying asset at an agreed-upon price on or before the expiration date of the contract.