Advance payment is a type of payment made prior to the delivery of goods or services. It is also known as a 'SUB' or 'ante'. This type of payment is often used in business transactions, such as when a customer pays for an order before it is shipped. It can also be used in other situations, such as when a tenant pays rent in advance. Advance payments are beneficial for both parties involved, as they provide assurance that the goods or services will be delivered and that the payment will be received.