Mechanical engineers are professionals who design, develop, and test mechanical systems and devices. They work on a wide range of products, from small components like gears to large systems such as aircraft and automobiles. Their work involves applying principles of physics and materials science to create efficient and reliable machines. These engineers often use computer-aided design (CAD) software to create detailed models and simulations of their designs. They collaborate with other engineers and professionals to ensure that their projects meet safety standards and performance requirements. Mechanical engineers play a crucial role in various industries, including manufacturing, aerospace, and energy.