Engineering is often characterised as having four main branches – mechanical engineering, chemical engineering, electrical engineering and civil engineering.

Mechanical engineering
Designing physical or mechanical systems, such as power and energy systems, aerospace products, weapon systems, transport products, engines, compressors and powertrains.

Chemical engineering
Exploiting chemical principles in order to carry out large-scale chemical processes, as well as designing new specialty materials and fuels.

Electrical engineering
Designing various electrical and electronic systems, such as electrical circuits, generators, motors, electromagnetic/electromechanical devices, electronic devices, electronic circuits, optical fibres, optoelectronic devices, computer systems, telecommunications and electronics.

Civil engineering
Designing and constructing public and private works, such as infrastructure – roads, railways, water supply and treatment – and buildings, dams and bridges.