An item master is a centralized database or record that contains comprehensive information about every product or SKU (stock keeping unit) offered by a retailer. It includes details such as product descriptions, pricing, dimensions, suppliers, and other relevant information. The item master serves as a key reference point for managing inventory, pricing strategies, and ensuring consistency in product data across various systems. Maintaining an accurate and up-to-date item master is crucial for effective inventory management, order fulfillment, and overall operational efficiency in the retail industry.