What is the defining characteristic of an express contract?

An express contract is defined by the clear articulation of its terms, which can be communicated either verbally or in writing. This clarity distinguishes it from other types of contracts, such as implied contracts, where terms are not explicitly stated but rather inferred from actions or circumstances. The express nature allows both parties to have a mutual understanding of their rights and obligations, which is crucial for avoiding misunderstandings and disputes. The explicit detailing of the terms also allows for easier enforcement and interpretation by legal authorities, providing both parties with a clear framework for their agreement.