Engine design refers to the process of creating and optimizing engines, which are machines that convert fuel into mechanical energy. This involves selecting materials, determining dimensions, and configuring components like pistons, cylinders, and crankshafts. The goal is to achieve efficiency, power output, and reliability while minimizing emissions and fuel consumption. Key factors in engine design include thermodynamics, fluid dynamics, and materials science. Engineers use computer simulations and prototypes to test their designs before production. Innovations in engine design can lead to advancements in related technologies, such as automobiles, aircraft, and power generation systems.