For anyone that is unfamiliar with the term urban sprawl, it refers to the gradual urbanization of otherwise undeveloped or rural land space. Urban sprawl can be any type of urbanization such as low-density residential development, high-density residential development, or commercial development. It can even mean infrastructural development, such as roads, power lines, water processing facilities, and other core urban structures spreading into rural lands. Regardless of the specific type of urban sprawl, the one constant factor is that human civilization has been creating urbanization since the end of hunter-gather societies.