Approach lights are a series of light signals located near the runway of an airport. They help pilots during the landing phase by providing visual guidance as they descend toward the runway. These lights typically illuminate in a specific pattern, indicating the correct approach path and helping to ensure a safe landing. The configuration of approach lights can vary, but they often include a combination of steady and flashing lights. They are part of the Instrument Landing System (ILS) and are crucial for pilots, especially in low visibility conditions, to align their aircraft accurately with the runway.