Definition
A spread strategy combines two or more option contracts — called legs — on the same underlying into a single position. By buying one option and selling another, a trader shapes a payoff that no single option can produce: the sold leg pays for part of the bought leg, lowering cost, while also capping the maximum gain.
Spreads trade away unlimited upside for two practical benefits: a smaller outlay and a defined risk profile. Most retail traders never learn them well, yet they are the workhorses of disciplined options trading because the best and worst outcomes are known before the trade is opened.
Why it matters
How it works
A vertical spread, the simplest form, uses two options of the same type and expiration but different strikes. A bull call spread buys a lower-strike call and sells a higher-strike one: the trader profits if the underlying rises, but only up to the higher strike, and the loss is capped at the net cost paid.
Other spreads stack legs differently. Calendar spreads use different expirations to trade time decay; iron condors combine a call spread and a put spread to profit when the underlying stays in a range. In every case the structure is intentional — each leg has a job, and the combined payoff is engineered, not accidental.