Urbanization refers to the increased growth of city centres compared to rural communities. Many factors cause urbanization, including regional and international movement of rural populations to city centres. Urbanization requires urban and rural communities to adjust to population changes, including economic, infrastructure, housing, and environmental changes. tion refers to the increased growth of city centres compared to rural communities. Many factors cause urbanization, including regional and international movement of rural populations to city centres. Urbanization requires urban and rural communities to adjust to population changes, including economic, infrastructure, housing, and environmental changes.