Plain English Meaning
Airports set up only for flying when the weather is clear enough to see and navigate by looking outside. There is no published instrument approach to get in or out when the weather is poor.
Full Definition
Airports that do not have a published instrument approach procedure and are intended for use under Visual Flight Rules. Pilots arriving at or departing from these airports must operate in visual meteorological conditions because no approved procedure exists to descend through cloud or low visibility using instruments alone.
Context Anchor
Seen in instrument procedure and radar assistance discussions when deciding what airports are if a needs help, a , or a place to land.