Void Contracts Never valid from the start. Illegal subject matter (drug deals, hired assassinations), contracts with someone lacking legal capacity (minors, mentally incompetent), or impossible terms make contracts void. Voidable Contracts Valid unless one party chooses to void it. Reasons include fraud, misrepresentation, duress, undue influence, or one party is a minor. Party with grounds to void can choose to enforce or cancel. Unenforceable Contracts Valid but can't be enforced in court due to technicality. Statute of frauds violations (should be written but isn't), statute of limitations expired, or procedural defects. Practical Implications Void = no contract ever existed. Voidable = valid until canceled. Unenforceable = valid but can't sue on it.