What is the difference between EDI and punchout?

EDI sends business documents between the buyer's and supplier's systems. Punchout lets a buyer shop the supplier's website from inside their procurement system.

Updated

EDI sends business documents (purchase orders, acknowledgments, shipping notices, invoices) directly between the buyer's and the supplier's systems, with no website involved. Punchout lets a buyer open the supplier's website from their procurement system, such as SAP Ariba, Coupa or Jaggaer, build a cart at contract prices and send it back for approval. The approved purchase order then reaches the supplier, sometimes by EDI.

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