The Central Business District is a symbol and symbol of urban modernization. It is the core of the city's function. It is a dense area of urban economy, science and technology, and culture. It is generally located in the golden area of the city. A large number of financial, business, cultural, service and a large number of business offices and hotels, apartments and other facilities are concentrated. With the most comprehensive infrastructure and good environment for transportation, communications, and other modernization, a large number of companies, financial institutions, and consortiums of enterprises conduct various business activities here. For example, Sydney has a Sydney Central Business District and Hong Kong's business districts are in Central and Tsim Sha Tsui. The United States and Canada and other places called the commercial center area "Downtown" (city business district; downtown area) because the past residential areas are all on the mountains, and the shopping streets are all under the mountains. Japan and South Korea call the central business district a "metropolis" or "prosperous street."
Most of the CBDs are located in the main core areas of a country or region. There are various first-class buildings and complete public facilities in the area, such as Grade A commercial buildings, shopping malls, government and public institutions, recreation and entertainment facilities, and so on. In addition, the traffic in the area is extremely high, and the main roads, railways, ports, and airports are all conveniently located around the area, making it convenient for citizens to travel between the various areas. CBD covers an area of 3 to 5 square kilometers, and some are even larger. The total construction area is as small as 5 to 6 million square meters, and as many as tens of millions of square meters. The CBD is not only a functional core of a city but also a modern one. An important symbol of the city is that its central land price is often much higher than the surrounding area of the CBD.