Although quite similar, the difference between forming and molding comes down to their unique features and benefits, depending on the application they are being used for. Injection molding is more suitable for large production runs of small, intricate parts and involves injecting liquid polymers into a mold using extreme pressure and temperatures. Thermoforming, also referred to as vacuum forming, is more suitable for shorter production runs of large-scale designs and involves forming heated plastic sheets to a mold's surface.