The document discusses injection moulding and its various types. It defines injection moulding as a manufacturing process that injects molten material into a mould to produce parts. Some key types discussed include thin wall moulding, which focuses on producing light, thin plastic parts; gas-assisted injection moulding, which uses gas to push plastic into mould extremities; and metal injection moulding, which mixes powdered metal with binders before shaping using injection moulding. The document also briefly outlines liquid silicone injection moulding and 3D printing as additional injection moulding technologies. A variety of plastics used in injection moulding are listed at the end.