What's the difference between sketching and hand drawing?

The advantages of hand-drawing and board drawing are: hand-drawing can draw with pen and paper at hand anytime and anywhere, with low cost and good hand feeling, which is the only way to draw. Board painting is for the convenience of modification and color matching, not for the help of ideas in hand-drawn creation, and there is no loss of painting materials. Hand-drawing is an important professional compulsory course for students who are engaged in architecture, clothing display design, window design, home soft decoration design, space floral design, fine arts, gardens, environmental art, photography, industrial design, visual communication and other professional studies. In the process of learning renderings, copying is a very important content and link. It is an important index to measure college students' hand-drawing ability. At the same time, it also has a great influence on college students' graduation employment. Corresponding to this is the computer renderings. Hand painting is closely related to our modern life. Hand-painted forms include architecture, clothing, illustration, animation and so on. They are classified and have their own specialties. For architects, researchers, designers and other people engaged in design and painting, the study of hand-drawn design is a process throughout their career.