ATC is Air traffic control is a service which is provided by ground based Air traffic controllers. The primary purpose of ATC worldwide is to prevent collisions, organize and arrange the flow of air traffic. Air traffic controllers monitor the location of the aircrafts by radar signals and communicate with pilots by radio communications. The Air traffic controllers work within a system, coordinating patterns to ensure aircraft keep a safe distance in the air and on the ground also. The main goal of air traffic controllers is to ensure the safety of the aircraft , pilots etc.