Engineering is a special kind of science in which scientific principles are used to design and build machines, structures and several other items. There are several fields of engineering and the role of each field is different to each other although they might meet with each other at some point. Bridges, roads in short construction work checks out in civil engineering although electrical machines are prepared and design in electrical engineering. There are several other items including vehicles, tunnels are built in different engineering techniques.
The concept of engineering has been defined before 14th century although there was not only specific workshop for doing experiment on it. In the beginning of 20th century, engineering field grows very fats and in 21th century several fields have been defined. Now you have to do a proper course called engineering to be an engineer. The one will be the engineer of that field in which he/she has completed post-graduation study in engineering course.