Mechanical engineering is the discipline that applies the principles of engineering, physics, and material science for the design, analysis, manufacturing, and maintenance of mechanical systems. It is the branch of engineering that involves design, production, and operation of machinery. It is one of the oldest and broadest of the engineering disciplines.
The engineering field requires an understanding of core concepts including mechanics, kinematics, thermodynamics, materials science, structural analysis, and electricity. Mechanical engineers use these core principles along with tools like computer-aided design, and product lifecycle management to design and analyze manufacturing plants, industrial equipment and machinery, heating and cooling system, transport systems, watercraft, robotics, medical devices, weapons, and others.