A purchase order, often abbreviated to PO, is a commercial document issued by a buyer to a seller, indicating types, quantities, and agreed prices for products or services required.[1] It is used to control the purchasing of products and services from external suppliers.[2] Purchase orders can be an essential part of enterprise resource planning system orders.
An indent is a purchase order often placed through an agent (indent agent) under specified conditions of sale.[3]
The issue of a purchase order does not itself form a contract. If no prior contract exists, then it is the acceptance of the order by the seller that forms a contract between the buyer and seller.