Mechanical drawing, as its name implies, is used to draw drawings of mechanical parts, expressing the structural shape, size, working principle and technical requirements of machinery in the form of drawings.

Engineering drawing generally refers to drawings used for drawing engineering planning, design or construction, such as housing construction engineering, smelting engineering, mining engineering, chemical and petroleum engineering, water conservancy and hydropower engineering, power engineering, agriculture and forestry engineering, railway engineering, highway engineering, port and waterway engineering, aerospace engineering, communication engineering, municipal public engineering, electromechanical installation engineering, etc.