What does IFR stand for in aviation?

The abbreviation IFR stands for Instrument Flight Rules. This is a set of regulations under which a pilot operates an aircraft in weather conditions generally poor enough to require reliance on instruments for navigation and control, rather than visual reference. IFR is crucial for aircraft operations in low visibility conditions, allowing pilots to fly safely and efficiently through clouds or inclement weather. Under IFR, pilots must adhere to specific procedures for communication and navigation, ensuring that aircraft can maintain separation, avoid obstacles, and arrive safely at their destination. The other options do not accurately represent the established rules and standards governing instrument flight operations in aviation.