Contracts are legally binding agreements between two or more competent parties that usually involve employment, sale or lease of property, or tenancy. The key elements of a valid contract are offer, acceptance, consideration, intention to create legal relations, capacity to contract, certainty of terms, and free consent. Minors and mentally impaired individuals generally lack the capacity to enter into contracts. For a contract to be enforceable, it requires an offer, acceptance of that offer, and consideration or valuable benefit exchanged between the parties.