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All of engineering is concerned with building things! The word "engineering" is literally derived from "one who operates an engine", and the word "engine" itself is of even older origin, ultimately deriving from the Latin ingenium (c. 1250), meaning "innate quality, especially mental power, hence a clever invention!
Whichever field of engineering you choose, you can involve yourself in "building things". Look at the following descriptions of what are considered the four main branches of engineering:
Chemical engineering The application of physics, chemistry, biology, and engineering principles in order to "carry out" chemical processes on a commercial scale.
Civil engineering The "design" and construction of public and private works, such as infrastructure (airports, roads, railways, water supply and treatment etc.), bridges, dams, and buildings.
Electrical engineering The "design" and study of various electrical and electronic systems, such as electrical circuits, generators, motors, electromagnetic/electromechanical devices, electronic devices, electronic circuits, optical fibers, optoelectronic devices, computer systems, telecommunications, instrumentation, controls, and electronics.
Mechanical engineering The "design" of physical or mechanical systems, such as power and energy systems, aerospace/aircraft products, weapon systems, transportation products engines, compressors, powertrains, kinematic chains, vacuum technology, and vibration isolation equipment.
Notice the words I have put in quotes? All there! Let me know if you have further questions. Hope this helps!