Explain, in detail, an "enforceable contract." (What is required for an agreement to be a binding contract?)

Chapter 9 through 18 part III about contracts Explain, in detail, an enforceable contract. What is required for an agreement to be a binding contract? Provide an example of an enforceable contract and explain why it is enforceable. Explain, in detail, an unenforceable contract.Provide an example of an unenforceable contract and explain "why" it is unenforceable. Explain, in detail, a non-contractual promise. Provide an example of a non-contractual promise that is "enforceable," and explain "why" it is enforceable. Provide an example of a non-contractual promise that is "unenforceable," and explain "why" it is unenforceable