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The flag of China, officially the National Flag of the People's Republic of China and also often known as the Five-starred Red Flag, is a Chinese red field charged in the canton (upper corner nearest the flagpole) with five golden stars. The design features one large star, with four smaller stars in a semicircle set off towards the fly (the side farthest from the flag pole). It has been the national flag of China since the foundation of the People's Republic of China on 1 October 1949. The red represents the Chinese Communist Revolution and the five stars and their relationships to each other represent the unity of the Chinese people under the leadership of the Communist Party of China (CPC). The first flag was hoisted by the People's Liberation Army (PLA) on a pole overlooking Beijing's Tiananmen Square on 1 October 1949, at a ceremony announcing the establishment of the People's Republic of China.Other flags used in the People's Republic use a red background to symbolize the revolution in conjunction with other symbols. The flag of the People's Liberation Army uses the gold star with the Chinese characters 8-1 (for 1 August, the date of the PLA's founding). The flag of the Communist Party of China replaces all of the stars with the party emblem. Due to government regulations, cities and provinces of China cannot have their own flags; the only subnational flags that exist are those of the Hong Kong and Macau Special Administrative Regions.

Source: Wikipedia