Vacuum infusion is a manufacturing process used to create composite materials. It involves placing dry reinforcement materials, like fiberglass or carbon fiber, in a mold and then sealing it. A vacuum is applied to remove air, which helps the resin flow evenly through the fibers. Once the vacuum is established, liquid resin is introduced into the mold. The pressure difference created by the vacuum pulls the resin into the dry materials, ensuring thorough saturation. This method is often used in industries like aerospace and automotive for producing lightweight, strong components.