Sale on Approval Acknowledgement is a type of contract that is used when a sale is made contingent on the buyer's approval of the goods. It is a written acknowledgement of the sale's terms and conditions, including the buyer's right to return the goods if they are not satisfactory. There are two types of Sale on Approval Acknowledgement: Unconditional and Conditional. Unconditional Sale on Approval Acknowledgement does not state any conditions for the buyer to receive the goods. The seller will then provide the goods to the buyer despite any objections from the buyer. Conditional Sale on Approval Acknowledgement, on the other hand, states specific conditions that must be met in order for the buyer to receive the goods. The seller may require the buyer to pay a deposit, provide security, agree to specific terms, or take other actions before the goods are released.