Mechanical engineering is a discipline of engineering that applies the principles of physics and materials science for analysis, design, manufacturing, and maintenance of mechanical systems. It is the branch of engineering that involves the production and usage of heat and mechanical power for the design, production, and operation of machines and tools. It is one of the oldest and broadest engineering disciplines. Major areas of mechanical engineering industry include designing, manufacturing, finding out the strength of materials or the amount of heat transfers or energy conversion, studying solid mechanics, thermodynamics, fluid mechanics, instrumentation and measurement etc. Mechanical engineers use these core principles along with tools like computer-aided engineering and product lifecycle management to design and analyze manufacturing plants, industrial equipment and machinery, heating and cooling systems, transport systems, aircraft, watercraft, robotics, medical devices and more.

In a way, mechanical engineers are involved in creating the future. They are the driving force behind many of our technologies and industrial processes including innovative products like mobiles, PCs and DVD etc in our modern world. The work of a Mechanical Engineer can be extremely challenging and fulfilling, requiring IT, design and analytical skills together with an ability to work as a team. As their work involves production, transmission and use of mechanical power and heat, they have to analyze the different materials used for the machines and their tolerances, investigate the different energy sources. Most mechanical engineering programs also require varying amounts of research or community projects to gain practical problem-solving experience.