A purchase invoice is an important document in business transactions that serves as evidence of a purchase agreement between a buyer and a seller. Understanding the basics of a purchase invoice is crucial for both parties involved in the transaction. In this article, we will explore the definition of a purchase invoice, discuss its importance in business transactions, delve into the key components of a purchase invoice, differentiate between purchase invoices and sales invoices, examine the role of purchase invoices in accounting, and highlight the legal implications associated with purchase invoices.