Approach-lights are an integral part of any airport's lighting system. Approach-lights guide pilots during their landing approaches and help ensure a safe touchdown. Some of the synonyms for approach-lights include: 1. Runway lights 2. Landing lights 3. Approach path indicators 4. Glide slope lights 5. Visual approach slope indicators These lights work together to provide pilots with the necessary visual cues to land safely. Some approach-lights also utilize different colors, such as green lights indicating the beginning of the runway, and red lights indicating the end. Pilots must be familiar with the airport lighting system to effectively and safely land their aircraft.