An artificial horizon is a device used in aviation and navigation to indicate the orientation of an aircraft or vessel relative to the Earth's horizon. It helps pilots and navigators maintain level flight or course, especially in conditions where the natural horizon is not visible, such as in clouds or at night. The device typically uses a gyroscope to provide a stable reference point. When the aircraft tilts, the artificial horizon displays this change, allowing the pilot to make necessary adjustments. This tool is crucial for safe navigation and is often found in the cockpit of aircraft and on marine vessels.