Procurement is where your company spends, carefully. It holds your suppliers and everything that flows from them: the purchase orders you place, the goods receipts that bring stock in, the purchase invoices suppliers send you, the payments that settle them, and the debit notes that correct a supplier's charge. Around that chain sit the two disciplines that separate tidy buying from hopeful buying: landed cost, which insists that the true cost of goods includes getting them to your door, and GRNI — goods received, not invoiced — which keeps the books honest in the gap between the delivery truck and the supplier's invoice.
Used well, Procurement answers: What have we committed to buy, and what is still to come in? What do we owe, and when? What did this stock really cost us, freight and duty included? Which receipts are still waiting for their invoices? Its chain mirrors Sales, with one addition Sales never needs: in [Standard], three documents must agree — what you ordered, what you received, and what you were invoiced — and the module is built to keep that agreement visible at every step.