A "Status Light" is a visual indicator that shows the operational state of a device or system. It typically uses different colors, such as green for normal operation, yellow for a warning, and red for an error or malfunction. Status lights are commonly found on electronic devices like computers, routers, and appliances, helping users quickly assess their functionality. These lights can also be integrated into software applications, providing users with real-time feedback on processes or tasks. For example, a progress bar may include a status light to indicate whether a file is uploading successfully or if there is an issue that needs attention.