Void means something that is null and completely without legal force or binding effect. A void Contract is a contract that is null and without legal effect. This means that the contract is unenforceable by law and such a contract cannot be enforced by any of the parties to the contract.
Void Contract and Void Agreement are two different things. Voidable means something that is not fully or completely void but may be avoided. A voidable Contract is valid, binding, and enforceable by law.