Die and mould design encompasses the comprehensive engineering discipline dedicated to creating the tooling systems used in manufacturing processes like injection molding, die casting, and stamping. While the terms are sometimes used interchangeably, they often refer to distinct applications: "mould" typically describes tools for shaping plastics or non-ferrous materials through processes like injection molding, while "die" often refers to tools for metal forming operations like die casting or stamping. The design process shares fundamental principles regardless of application, beginning with thorough analysis of the part design to identify potential manufacturing challenges. Critical design elements include the cavity and core system that defines the product geometry, feeding systems to deliver material properly, ejection mechanisms for part removal, and temperature control systems to manage thermal conditions. For molding applications, the design focuses on polymer flow behavior, shrinkage compensation, and cooling channel optimization. For die casting, the emphasis shifts to managing molten metal flow, thermal fatigue resistance, and venting systems. Stamping die design concentrates on material formability, punch and die clearance, and strip layout optimization. Modern design practices heavily utilize advanced CAD/CAE software for 3D modeling, simulation of manufacturing processes, and structural analysis. Material selection is critical, with tool steels chosen based on production requirements, wear resistance needs, and thermal management considerations. The design must also address practical manufacturing concerns including ease of maintenance, component interchangeability, and compatibility with production equipment. Successful die and mould design delivers robust manufacturing systems that produce high-quality components consistently while optimizing production economics through extended tool life, reduced cycle times, and minimized scrap rates. This engineering discipline serves as the critical link between product design and mass production across virtually every manufacturing sector.