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Industrial engineering is the engineering discipline that concerns the design, development, implementation, and evaluation of integrated systems of people, knowledge, equipment, energy, and material. Industrial engineering draws upon the principles and methods of engineering analysis and synthesis, as well as mathematics, physical, and social sciences. Industrial engineers work to eliminate wastes of time, money, materials, energy, and other resources.

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Whereas most engineering disciplines apply skills to very specific areas, industrial engineering is applied in virtually every industry. Examples of where industrial engineering might be used include shortening lines (or queues) at a theme park, streamlining an operating room, distributing products worldwide, and manufacturing cheaper and more reliable automobiles.

The name “industrial engineer” can be misleading. While the term originally applied to manufacturing, it has grown to encompass services and other industries as well. Other similar fields include operations research, systems engineering, ergonomics and quality engineering.

Source: Wikipedia