This document is produced when goods are shipped to the customer. It might list the goods, quantities, weights, how it was shipped and the delivery time. A copy is sent to the accounts department so that they can match it with the sales order and raise a sales invoice for the goods.
This website is for education and information purposes only, is not intended to provide professional advice. This blog is written from a UK perspective. This site should not be used as a substitute for competent professional advice from a qualified accountant.
(Also note - Tax, Law and businesses can change quickly: always check the date of the post!)