An injection molding machine is a crucial manufacturing device used in the plastics industry. It functions by melting plastic pellets or granules and then injecting the molten plastic into a mold cavity under high pressure. The mold, which is typically made of metal, gives the final product its desired shape and size. This process allows for the mass production of plastic parts with high precision and repeatability. It is widely used in various fields such as automotive, electronics, and consumer goods manufacturing.