The concept of a contract is a legal agreement between two or more parties, binding them to act in a predetermined manner. A valid and enforceable contract must have free consent from both parties, and only then can it be considered a legally binding agreement. The content highlights the importance of mutual consent, as an absence of it renders the contract invalid. Voidable contracts are those that are initially valid but can be rejected by one party if found to have defects, such as coercion or misunderstanding. The article also touches upon different types of contracts based on their validity and execution, including express, implied, quasi, executed, and executory contracts. Ultimately, understanding the concept of a voidable contract is crucial in ensuring that parties are aware of their rights and obligations within a legal agreement.