Cash drawer is a secure, compartment-filled container, typically part of a point-of-sale (POS) system, that holds and organizes cash, coins, receipts, and other items exchanged during business transactions. Designed to connect with a cash register or POS printer for automatic opening, cash drawers feature a removable, adjustable tray with sections for different denominations and sometimes a media slot for unopenable storage, playing a crucial role in managing cash flow and transaction accuracy.