ALAR is an acronym for the Automatic Landing and Alerting Radar system, which is a type of radar used in aviation. It is designed to detect aircraft in the vicinity of an airport and provide information about their altitude, speed, and direction. ALAR also provides alerts when an aircraft is approaching an airport too low or too fast, allowing pilots to take corrective action. ALAR is an important safety feature for airports and aircraft, helping to reduce the risk of accidents.