In finance, a single-stock future (SSF) is a type of futures contract between two parties to exchange a specified number of stocks in a company for a price agreed today (the futures price or the strike price) with delivery occurring at a specified future date, the delivery date. The contracts are traded on a futures exchange. The party agreeing to take delivery of the underlying stock in the future, the "buyer" of the contract, is said to be "long", and the party agreeing to deliver the stock in the future, the "seller" of the contract, is said to be "short". The terminology reflects the expectations of the parties - the buyer hopes or expects that the stock price is going to increase, while the seller hopes or expects that it will decrease. Because entering the contract itself costs nothing, the buy/sell terminology is a linguistic convenience reflecting the position each party is taking - long or short.