Billings refer to the total amount of revenue that a business has generated from its customers for goods or services that have been delivered or used, but not yet paid for. In other words, billings represent the value of goods or services that a business has provided to its customers on credit, and they are typically recorded on the company's balance sheet as accounts receivable. Billings are different from revenue, which is the amount of money that a business has actually received from its customers. Billings are an important metric for businesses because they provide an indication of the future revenue that the company can expect to receive.