Mechanical engineering involves the analysis, design, manufacturing and maintenance of various systems. It is one of the oldest and broadest engineering disciplines. Mechanical engineering is an essential to a wide range of activities that include the design, development, manufacture, management, and control of engineering systems, subsystems, and their components. Typically the manufacturing, power, aerospace, automotive, materials and processing industries employ mechanical engineers. As a result of the recent rapid expansion of technology, mechanical engineers also have become increasingly involved in computer aided design and visualization; robotics; bio-engineering; solar; wind and ocean energy sources; and space exploration. The breadth of the field provides the mechanical engineers with many possibilities for a satisfying career.