To request the purchase of goods or services, a buy requisition internal form is employed. It might be a conventional letter or an electronic version. Before making the purchase, the purchase requisition and purchase order must be approved by the appropriate authority. Employees that require certain products or services to do their jobs frequently file purchase requisitions. Buy requisitions are a crucial component of the procurement process since they guarantee that only authorised purchases are made at all times. Also, they help to document the requests made, which is useful for budgetary and auditing purposes.