Invoicing refers to the process of creating and sending an invoice as a request for payment. It is typically done by businesses after they have completed a job, sold a product or provided a service to a customer. The invoice includes information such as the date of the transaction, the items purchased/services rendered, the price, taxes, and any additional charges. Once the invoice is received, the customer has the option to pay the amount owed within an agreed upon timeframe. Invoicing is an important part of maintaining good cash flow for a business as it helps ensure that they are paid on time for their work or products/services provided.