What is a type of agreement where both parties must follow rules to make the contract enforceable?

A conditional contract is an agreement between parties that is dependent on certain events or conditions being fulfilled. For the contract to be enforceable, both parties must meet specific criteria or follow established rules outlined in the contract. This type of contract establishes clear expectations for performance, ensuring that neither party is obligated until the conditions are satisfied.

In contrast, a unilateral contract involves only one party making a promise in exchange for an act, with no need for the other party to fulfill any conditions. An express contract is characterized by clearly stated terms but does not necessarily require conditions to be met for enforceability. An adhesive contract typically refers to a standardized agreement where one party has more power than the other, often without negotiation, but does not focus on mutual conditions for enforcement.