A keyboard tray is a movable platform designed to hold a computer keyboard and mouse, typically mounted under a desk. It allows users to adjust the height and angle of their keyboard, promoting better ergonomics and reducing strain on the wrists and arms during extended computer use. These trays can be fixed or adjustable, catering to different user preferences and desk setups. By positioning the keyboard at a comfortable level, keyboard trays help maintain a neutral wrist position, which can prevent repetitive strain injuries and improve overall comfort while working.