What is purchase order vs invoice ?

Definition

The terms invoice is a simple one- it's a document that you'd give to your customers summarizing the cost of their products or services. This can contain information on items sold, sales tax, shipping charges, and discounts. A purchase order is more complicated because it covers a much broader range of activities and should be handled by an organization or company with authority over the order. It could include the specification of what needs to happen before payment is sent and how long the order will take to fulfill. Purchase orders are also used for purchases that exceed a certain amount, which is often referred to as an open purchase order.