A specific geographic location that a location-service uses as a check-in. A venue can be considered the human-readable name for a specific latitude/longitude.
A venue is the first surface connection between the abstract and logical Cartesian grid system of a map and the messy, human-behavior driven understanding of location, place and space. People use venue names, computers use latitude/longitude.
A venue name is an indicator that a specific location has acquired human meaning beyond it’s simple location.