In operation: CAD generally needs to know the approximate size of the object before design. Graphic design software can design as long as it knows the approximate proportion and shape of the object.
In practical use: CAD is generally used as a construction drawing in real life, and designers should bear certain economic and legal responsibilities. The drawings of graphic design software can not be used as construction drawings, but only as construction reference and effect simulation.
In the demonstration effect: the demonstration effect of CAD is more professional, and auxiliary dimensions can be added, which can be understood by people with certain drawing experience. General graphic design software mainly beautifies the effect, and users will clearly understand the content of the design project.