What is a City

A city is a place gathering people to live together. It has well organized systems in order to make the city functions well, such as transportation systems, social security system, environmental protection agency, sanitary bureau, resource power system etc. Of course it has various types of building for different purpose, and they spread in different region of city. Most building are factories, houses, hospitals, schools, offices etc. Furthermore, the economic which is the market places or the trade centers of a city plays a significant role. It determine the prosperity of the district that people live. All in short, cities are structures for living and it would continue to develop.