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This video introduces important CADfix terminology and concepts to help you understand the difference between topology and geometry.

A CADfix face contains a collection of edges that usually form a closed loop. A CADfix edge defines the boundary of a face. The start and end positions of an edge are defined by referring to two points. A CADfix surface defines the 3D “shape” of the interior of a face. Points, edges and surfaces are geometrical entities because they represent the 3D position of an entity. Whereas bodies and faces are topological entities because they simply represent a collection of other entities. Topology is only related to how a model is connected**,** and this is what the repair process focuses on. The preparation stage will focus on the quality of the geometry and its compatibility with the target system.