VMC stands for Visual Meteorological Conditions. These are weather conditions in which flight can be conducted under Visual Flight Rules (VFR). In VMC, visibility is generally good, and cloud ceilings are high enough to allow pilots to maintain visual reference with the ground and other aircraft.

Flying in VMC typically implies good weather conditions with clear skies, allowing pilots to navigate and control the aircraft primarily by visual reference to the ground and other landmarks. It contrasts with Instrument Meteorological Conditions (IMC), where visibility is reduced, and reliance on instruments is necessary for safe flight, typically requiring adherence to Instrument Flight Rules (IFR).