Engineering
Engineering is the use of scientific principles to design and build machines, structures, and other items, including bridges, tunnels, roads, vehicles, and buildings. The discipline of engineering encompasses a broad range of more specialized fields of engineering, each with a more specific emphasis on particular areas of applied mathematics, applied science, and types of application. See glossary of engineering.
Manufacturing
Manufacturing is the making of goods by hand or by machine that upon completion the business sells to a customer. Items used in manufacture may be raw materials or component parts of a larger product. The manufacturing usually happens on a large-scale production line of machinery and skilled labor.
Installation
An installation engineer sets up and establishes computer systems or equipment for an organization. The job duties for installation engineers vary, depending on the industry of your employer. For example, positions that set up wide-scale computer networks require IT experience. Manufacturing firms need installation engineers familiar with the workings of industrial equipment and machinery. Installation engineers are also responsible for troubleshooting problems with the systems and may provide customer service to the client when issues arise.