Urbanization refers to the gradual shift in populations from rural to urban areas. It began during the Industrial Revolution due to job opportunities in cities and factories. Since then, the process has continued and accelerated due to factors like improved transportation, infrastructure development, and migration driven by lack of rural jobs. Today over half the world's population lives in urban areas, and urbanization is a major trend in developing countries as more seek opportunities in cities. India has seen significant urbanization driven by industrialization, which concentrates jobs and people in urban centers.