CBD is the abbreviation of Central Business District. Central Business District (CBD) originally originated in the United States in the 1920s, which means the place where businesses meet. In the 1950s and 1960s, in developed countries, the manufacturing industry in urban centers began to move out, and business office activities continued to gather in urban centers, requiring some big cities to re-plan and build modern business centers with a certain scale on the basis of the old business centers. Manhattan in new york, La Defense in Paris, Shinjuku in Tokyo and Central in Hong Kong are all relatively developed commercial centers in the world.

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In emerging cities, due to the lack of historical centers, the central business district and the city center often overlap. This situation is particularly common in North America. In North new york, this mixed central business district and downtown area is called "downtown area" (originally meaning "downtown area", but derivative words refer to downtown bustling business district or downtown area), because's early development area is the southern tip of Manhattan Island, just below the city on the map. Later, new york gradually developed northward, forming a relatively "residential area".

So in North America, "Uptown" can generally refer to suburbs or residential areas far away from the city center, and "Downtown" has become synonymous with the city center. In Australia and New Zealand, which are also emerging cities, some cities call this mixed central business district and city center "CBD", while others call it "city center".

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