In options trading, a vertical spread is an options strategy involving buying and selling of multiple options of the same underlying security, same expiration date, but at different strike prices. They can be created with either all calls or all puts. The term originates from the trading sheets that were used in the open outcry pits on which option prices were listed out by expiry date & strike price, thus looking down the sheet (vertical) the trader would see all options of the same maturity. Vertical spreads approximate binary options, and can be produced using vanilla options.