In SAP, "MM" stands for Materials Management. It is a key module within the SAP ERP system that focuses on managing materials, inventory, procurement, and warehouse processes. SAP MM ensures that materials are available in the right quantities at the right time to avoid shortages and optimize supply chain efficiency. It covers activities such as purchasing, inventory management, goods receipt, invoice verification, and material master data maintenance. The module integrates with other SAP components like Production Planning (PP), Sales and Distribution (SD), and Finance (FICO) to support logistics and supply chain operations effectively