A paper tray is a component of a printer or copier that holds sheets of paper before they are printed on. It is designed to keep the paper organized and ready for use, ensuring that the machine can operate efficiently. Paper trays can vary in size and capacity, accommodating different types of paper, such as letter or legal size. Most printers have at least one paper tray, but some models may include multiple trays for different paper types or sizes. The trays are usually adjustable, allowing users to change the paper size as needed. Properly loading the paper tray helps prevent jams and ensures smooth printing operations.