In
business or
commerce, an
order is a stated intention, either spoken or written, to engage in a commercial transaction for specific products or services. From a buyer's point of view it expresses the intention to buy and is called a
purchase order. From a seller's point of view it expresses the intention to sell and is referred to as a
sales order. When the purchase order of the buyer and the sales order of the seller agree, the orders become a
contract between the buyer and seller.