Mechanical engineering is an applied science and engineering discipline concerned with the design, analysis, manufacturing, and maintenance of mechanical systems. It encompasses the principles of classical mechanics, thermodynamics, materials science, and fluid dynamics to develop machines and systems that perform work. Core areas of study include the efficient conversion of energy—whether from thermal, electrical, or mechanical sources—into useful forms, and the structural analysis of components under various stresses. The application of these principles allows for the creation of tools, engines, robots, and complex machinery used across diverse industries, from power generation to transportation and biomedical devices.