What does the term "Handoff" refer to in air traffic control?

In air traffic control, "Handoff" specifically refers to the process of transferring radar identification and control of an aircraft from one air traffic controller to another. This occurs typically when an aircraft moves from one airspace sector to another or when it transitions between different areas of control within the same airport. During a handoff, the first controller communicates relevant information about the aircraft, such as its current heading, altitude, and any pertinent flight details, to ensure a seamless transition of responsibility. This process is crucial for maintaining safety and operational efficiency, as it allows for continuous monitoring and guidance of aircraft as they move through various phases of flight.

Other options relate to different aspects of aviation and air traffic operations. Releasing control pertains to the procedural aspect of transitioning responsibility, but the essence of a handoff is the transfer of radar identification. Conducting maintenance impacts the aircraft's condition rather than the operational control. Similarly, providing weather updates is part of operational support, but not directly related to the specific process of a handoff. Thus, the answer that emphasizes transferring radar identification encapsulates the fundamental purpose and function of a handoff in air traffic control.