Air traffic controllers are professionals responsible for ensuring the safe and efficient movement of aircraft in the sky and on the ground. They communicate with pilots using radio transmissions, providing instructions for takeoff, landing, and navigation. Their primary goal is to prevent collisions and manage air traffic flow in busy airspaces. These controllers work in control towers at airports, area control centers, and en-route centers. They use radar and other technology to track aircraft positions and monitor weather conditions. The job requires strong communication skills, quick decision-making, and the ability to remain calm under pressure, as they play a crucial role in aviation safety.