Mass production is a manufacturing method that efficiently and continuously produces large quantities of products to meet market needs. Its characteristics lie in pursuing economies of scale, simultaneously achieving minimized unit costs, uniform quality, and stable supply. It is an indispensable production method in a wide range of fields, including automotive parts, home appliances, electronic devices, and daily necessities. Representative processing methods include press working, injection molding, die casting, automated cutting, and robotic welding. The construction of dedicated molds, jigs, automated machinery, and optimized production lines is key, and while it involves high initial investment, it achieves high productivity and competitiveness through reduced cycle times and improved yields.