An invoice document is an official statement that records the sale of goods or services between a buyer and a seller. It is usually sent to the buyer by the seller once they have accepted payment for the goods or services listed on the document. Invoice documents typically contain details such as the type and quantity of goods or services sold, payment terms, any discounts given, and the total amount due. They also often feature contact information for both parties, serving as a record of the transaction in case of any disputes.