Both of them are necessary processes of product research and development, manufacturing and production. ID refers to industrial design, which is different for different industries. ICSID defines industrial design as: as far as mass-produced industrial products are concerned, with the help of training, technical knowledge, experience, visual and psychological feelings, new quality and specifications are given to product materials, structure, structure, modeling, color, surface treatment and decoration. In China, it can be simply understood as product design, but this is a narrow understanding. MD refers to (MechanicalDesign) structural design, such as mobile phone mold opening, product parting, internal stress, tensile and compressive strength of materials, etc. , mainly for engineering consideration. However, product design, R&D and manufacturing all need to be considered comprehensively. This is a huge project ~