The history of labor force has undergone significant changes from the Middle Ages onwards. Industrial revolution in the 18th century increased the demand for labor. The 19th century saw a rise in factories in the USA, UK, and Europe attracting more workers. Urbanization in the 20th century directed labor force towards cities. Technological advancements in the 1980s led to the growth of sectors requiring new skills. In the 21st century, the service sector saw a 50% increase in labor force, demanding retraining due to technologies and digital transformations. By 2023, the global labor force is estimated to reach around 3.5 billion