Why causes cities to become megacities?

Cities become megacities primarily due to rapid urbanization driven by factors such as economic opportunities, population growth, and migration from rural areas. Improved infrastructure, globalization, and industrialization attract people seeking jobs and a better quality of life. Additionally, social and political stability in urban areas can further enhance their appeal, leading to increased population density and expansion. These dynamics create a self-reinforcing cycle that propels cities into megacity status.