What is urban renewal?

Rebuild the old city. After the development of the times, some cities need to be rectified because they can't adapt to modernization, so the saying of urban renewal appears, which is a necessary and planned transformation activity for areas that can't adapt to modern urban social life. A city is a large human settlement, which can be defined as a permanent, densely populated place with administrative boundaries. Its members are mainly engaged in non-agricultural tasks and have a wide range of housing, transportation, health, public utilities, land use, commodity production and communication systems.