“Designing and building things that combine different disciplines, such as 3D modelling, electronics, metalwork, software, etc.”

Engineering

“Engineering is the practice of using natural science, mathematics, and the engineering design process to solve technical problems, increase efficiency and productivity, and improve systems.” – Wikipedia

In practical terms, for me it is designing and building things that combine different disciplines, such as 3D modelling, electronics, metalwork, software, etc. For example an autonomous vehicle, or a robotic arm.

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