Urbanization: The process by which an increasing proportion of the population lives in urban areas rather than rural areas. It often leads to denser populations in cities.
Megacity: An urban area with a population exceeding 10 million people. Megacities typically face significant challenges associated with managing resources and providing services for their large populations.
Overpopulation: When the number of individuals exceeds the carrying capacity (available resources) of a particular area. Overpopulated regions may struggle with issues such as poverty, strain on infrastructure, and environmental degradation.