A Customs Invoice is a document required by customs authorities for importing or exporting goods. It provides detailed information about the goods being shipped, such as their description, quantity, value, and country of origin. The Customs Invoice is used to determine the correct tariff classification, calculate duties and taxes, and ensure compliance with customs regulations. It is an important document in the supply chain as it facilitates the smooth movement of goods across borders and helps customs authorities assess the appropriate fees and charges associated with the import or export of goods.