The Multiple Nuclei Model is an urban land use theory developed by Chauncy Harris and Edward Ullman in 1945. It suggests that a city does not grow around a single central point, but rather has multiple centers, or "nuclei," where different activities and functions are concentrated. These nuclei can include commercial, industrial, and residential areas, each developing independently based on their specific needs and characteristics. This model highlights the complexity of urban growth, showing that cities can evolve in various ways due to factors like transportation, land use, and social dynamics. It helps explain the diverse patterns of urban development seen in modern cities, where different zones may emerge based on economic and social interactions.