What does CAD mean?
Computer Aided Design (previously sometimes called Computer Aided Drafting). The manipulation of points, lines, vectors, surfaces and sometimes solids by a computer programme to aid in the construction and description of real or virtual 2D or 3D objects. The programmes must include information about the materials, physical properties, dimensions and tolerances, and must be able to display or produce some usable output, in the form of visualisations or 2-dimensional graphic representations.