Gentrification: The process of renovating deteriorated urban neighborhoods by means of influxes of more affluent residents, often resulting in increased property values and displacing lower-income residents.
Urbanization: The increasing proportion of people living in cities rather than rural areas. It involves the growth and development of urban areas.
Megacity: A city with over 10 million inhabitants. Megacities face unique challenges due to their large populations and extensive infrastructure needs.