Urban growth is the increase in the size and population of cities. It became especially rapid during the Industrial Revolution in the 1800s. Many people moved from rural areas to cities.

Cities expanded with new housing, roads, and public services. Factories and jobs attracted workers, leading to crowded neighborhoods. Large cities such as London and New York grew quickly during this time.

Urban growth is measured using population data and city maps. It is studied in geography to understand how cities develop.