Primary sector: extraction of raw materials from the physical environment, e.g., fishing, forestry, farming, and mining
Secondary sector: processing raw materials, known as secondary economic activity, e.g., manufacturing industry and construction industry
Tertiary sector: service industries meeting consumer needs, e.g., accounting, teaching, driving, and music
Quaternary sector: ICT careers, involving research, development, and information, e.g., robotics, radiology, consultancy, and financial planning