A Call is an option contract that gives the holder the right (but not the obligation) to buy a certain quantity of an underlying security from the writer of the option, at a specified price (the strike price) up to a specified date (the expiration or maturity date). Also called call option.

As an example, a Call option on EURUSD of 100k with a strike price of 1.3600 set to an expiration of one year out. The buyer pays a premium for the opportunity to hold this option, and the holder is entitled to any profits should EURUSD close above the strike price a year out. Also the call itself will have value, and the holder may sell it back for a profit or loss at a later date.