A more thorough explanation:

An aleatory contract is a type of contract where the performance of one or both parties depends on an uncertain event. This means that the outcome of the contract is uncertain and depends on chance or luck.

For example, an insurance contract is an aleatory contract because the payment of the insurance premium is made in exchange for the possibility of a future event, such as a car accident or a house fire. The insured party may or may not experience the event, and the insurance company may or may not have to pay out the claim.

Another example of an aleatory contract is a gambling contract, where the outcome depends on chance or luck. For instance, if you bet on a horse race, you are entering into an aleatory contract because the outcome of the race is uncertain and depends on the performance of the horses.

Overall, aleatory contracts are unique because they involve an element of risk and uncertainty, which can make them exciting but also risky.