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A requisition is indeed a document that initiates the purchasing process. It is typically used internally within an organization to request the purchase of goods or services. The requisition outlines the details of what is needed, including quantity, specifications, and sometimes the estimated cost. This document is then reviewed and approved before a purchase order is created, which is sent to the supplier to formalize the transaction.

In contrast, a purchase order is the document that officially communicates the purchase to a supplier after the requisition has been approved. A contract agreement is a legal document that outlines the terms between parties for the provision of services or sale of goods, often resulting from negotiations and after a requisition and purchase order have been established. An invoice, on the other hand, is a request for payment issued by the supplier after the goods or services have been delivered. Thus, the requisition is essential as it starts the entire purchasing process.