Derivatives are financial contracts whose value is derived from some other underlying asset, rather than having independent value of their own — a wheat futures contract, for instance, derives its entire value from the price of wheat, not from anything intrinsic to the contract itself. Two of the most common derivative types, futures and options, both let a buyer and seller lock in today a price for a trade that will actually happen at some fixed point in the future, but they differ in one crucial respect: a futures contract is a binding obligation for both parties, while an options contract gives its holder a choice, which they only exercise if it turns out to be in their favour.
A futures contract locks both sides in, no matter what happens next
A futures contract commits both the buyer and the seller to complete a specific trade — a set quantity of some underlying asset, at a set price, on a set future date — regardless of what the market price of that asset turns out to be by the time the date arrives. If wheat's market price rises well above the price locked into the contract, the buyer benefits, having secured wheat more cheaply than the prevailing market rate; if the market price instead falls well below the locked-in price, the seller benefits instead, having secured a higher price than the market would otherwise have offered. Crucially, neither party can simply walk away from an unfavourable outcome once the contract is in place — the obligation to complete the trade at the agreed price binds both sides regardless of which direction the market subsequently moves.
An option offers the same locked-in price, but as a choice, not an obligation
An options contract works differently: it gives its holder the right, but explicitly not the obligation, to buy or sell the underlying asset at a set price by a set date. If the market moves in the holder's favour, they can exercise that right and benefit from the locked-in price; if the market instead moves against them, they can simply let the option expire unused, losing only the upfront price, called the premium, that they paid to acquire that right in the first place, rather than being forced into an unfavourable trade the way a futures contract's binding obligation would compel. This asymmetry — unlimited potential upside if the market moves favourably, but a loss capped at the premium paid if it doesn't — is exactly what the option's buyer is paying for, and it's a fundamentally different risk profile from a futures contract, where both the potential gains and the potential losses for each party are, in principle, unbounded.
What we're still unsure about
The structural distinction between a futures contract's binding obligation and an option's optional right is well-established, precisely defined financial theory, not a matter of genuine dispute. What's considerably more contested, and remains an active area of financial research and regulatory debate, is how large a role derivatives trading of this kind plays in amplifying, versus genuinely dampening, broader financial market instability — derivatives were originally developed mainly as tools for managing and transferring risk that already existed elsewhere in the economy, such as a farmer locking in a price for a future harvest, but the same instruments can also be used for leveraged speculation on price movements, and how much of the market's overall derivatives activity falls into each category, and what that mix implies for financial system stability, is a question economists and regulators continue to study rather than one with a single settled answer.
This sits inside Derivatives: Options, Futures & Swaps, one of eight topics in Finance, one of five domains in Economics, one of seventeen subjects the app can quiz you on.