VFR stands for "Visual Flight Rules," a set of regulations under which a pilot operates an aircraft in weather conditions generally clear enough to allow for visual navigation. Under VFR, pilots must maintain a certain distance from clouds and have a clear view of the ground, enabling them to navigate using visual references rather than relying solely on instruments. VFR is commonly used in general aviation, where pilots fly smaller aircraft for personal or recreational purposes. It contrasts with IFR, or "Instrument Flight Rules," which are used in less favorable weather conditions when pilots must rely on instruments for navigation and control.