A more thorough explanation:

Definition: Legality refers to the state of being lawful or in accordance with the law. In contract law, a contract must have a legal purpose in order to be enforceable.

Example 1: It is illegal to sell drugs, so a contract for the sale of drugs would not be considered legal.

Example 2: A contract between two parties to rob a bank would also not be considered legal, as it involves criminal activity.

These examples illustrate the importance of legality in contract law. In order for a contract to be enforceable, it must have a legal purpose. Any contract that involves illegal activity, such as the sale of drugs or planning a crime, would not be considered legal and therefore would not be enforceable in court.