ERP vs OMS vs PIM vs WMS: Who owns what in Ecommerce?

ERP vs OMS vs PIM vs WMS — what’s the difference, what does each system actually do, and which one owns your ecommerce data? In this visual ecommerce architecture explainer, we break down ERP, OMS, PIM and WMS systems by following a single product through its entire journey — from product creation and merchandising to checkout, order routing, warehouse fulfillment and shipping. Instead of memorizing four enterprise software definitions, you’ll see how these systems actually work together in a modern ecommerce technology stack. We’ll cover: • ERP (Enterprise Resource Planning) — business operations, purchasing, suppliers, inventory and financial data • PIM (Product Information Management) — product descriptions, attributes, imagery, localization and enriched product data • OMS (Order Management System) — order orchestration, inventory availability, fulfillment routing, ship-from-store and omnichannel orders • WMS (Warehouse Management System) — warehouse inventory, picking, packing and shipping • Ecommerce platforms — how platforms such as Shopify fit into the architecture • Source of truth — why ERP, OMS, WMS and ecommerce platforms can all contain the same data without necessarily owning it You’ll also see why a seemingly simple question like “Which system owns inventory?” can become surprisingly complicated. For example, a WMS might know that 83 units physically exist inside a distribution center. An OMS may determine that only 75 are actually available to sell after accounting for committed inventory and safety stock. The ecommerce platform may simply receive that final available quantity. All three systems have inventory data - but they have very different responsibilities. That distinction between where data EXISTS and which system OWNS its meaning is fundamental to designing reliable ecommerce integrations and enterprise architecture. ━━━━━━━━━━━━━━━━━━━━ WHO IS THIS FOR? This video is designed for: • Ecommerce professionals • Solutions and technic