The increase in population growth in big cities is referred to as

The increase in population growth in big cities is referred to as urbanization. Urbanization is the process of the migration of people from rural areas to urban areas, resulting in the growth and expansion of cities. This process is usually driven by economic opportunities, social factors, and modernization. As people move to cities, the population increases, leading to the development of infrastructure, housing, and other amenities to support the growing population. Urbanization can have both positive and negative impacts on society, such as increased economic opportunities and improved access to services, as well as overcrowding, pollution, and social problems.