SAP SD (Sales and Distribution) is one of the primary modules in the SAP ERP system that handles all processes related to order-to-cash. It is designed to manage the complete sales and distribution cycle of products and services, from receiving a customer inquiry to product delivery and billing.SAP SD enables organizations to streamline their sales operations, track customer orders, manage pricing and discounts, and ensure timely delivery and accurate billing. It integrates closely with other modules such as SAP MM (Materials Management) and SAP FICO (Finance and Controlling) for a seamless business workflow.