Although the terms ERP and WMS (warehouse management system) are sometimes used interchangeably, there are notable differences between the two. A WMS is primarily used to manage product movement and storage within your warehouses, whereas ERP systems automate business processes like accounting, purchasing, order processing, and CRM.
In the end, both ERP and WMS are part of the bigger picture of supply chain management, by helping ecommerce businesses function more efficiently and economically.