In the world of business transactions, invoices play a crucial role in ensuring smooth financial operations. However, not all invoices are the same. There are two main types: PO (Purchase Order) invoices and non-PO invoices. Understanding the differences between these two types is essential for effective invoice management. In this article, we will explore the basics of invoices, define PO and non-PO invoices, and discuss their differences and importance in financial records and vendor relationships.