Invoicing is the process of creating and sending a document, known as an invoice, to request payment for goods or services provided. An invoice typically includes details such as the seller's and buyer's information, a description of the products or services, the total amount due, and payment terms. Invoices serve as a formal record of a transaction and help businesses keep track of their sales and outstanding payments. They can be sent in various formats, including paper or digital, and are essential for maintaining financial organization and ensuring timely payments.