A purchase order is a buyer's request to a seller to order goods.
A purchase order is not an active order upon creation but upon acceptance from the seller. Generally, the item(s), prices and quantities have already been negotiated. Once accepted by the seller, a purchase order becomes a legal agreement to provide the mentioned goods at the agreed-upon price.
A Purchase order must includes
1. Company information (name etc.)
2. Shipping details (address)
3. Vendor information (name and address)
4. Order information (product, price, and quantity)