What does the term "radar contact" refer to in an IFR context?

In an IFR (Instrument Flight Rules) context, "radar contact" specifically refers to the confirmation by Air Traffic Control (ATC) that they can see an aircraft's radar return on their radar display. When ATC declares that they have radar contact with an aircraft, it indicates that they are tracking the aircraft's position and can provide guidance, instructions, and separation from other aircraft based on that information. This communication is crucial for maintaining safety and efficiency in controlled airspace, as it allows ATC to monitor the aircraft's flight path and ensure it is adhering to the flight plan as well as responding to any air traffic situations that may arise. This clarity helps facilitate smooth operations and effective communication between pilots and ATC.