AutoCAD MAP 3D - What is meant by a feature?

Question
What is meant by a feature?

Answer
A feature is an abstraction of a natural or man-made real world object. A spatial feature has one or more geometric properties. For example, a road feature might be represented by a line, and a hydrant might be represented by a point. A non-spatial feature does not have geometry, but can be related to a spatial feature that does. For example, a road feature may contain a footway feature that is defined as not containing any geometry. In AutoCAD Map 3D, features are accessed and added to maps using Data Connect ( FDO ) or by opening an industry model drawing or an enterprise industry model.