Officially titled the People's Republic of China, China has the highest population of any country on Earth. It has the second largest economy, is a nuclear power and has a permanent seat on the United Nation's Security Council. It is also a communist country.
In 1949 under Leader Mao Zedong, China became a communist country.
The state took control of the factories, businesses, the land etc, on behalf of the people. There was no private ownership. The Communist Party of China (CPC) took control and the people worked on behalf of the common good. According to Mao, the idea of individual progress at the expense of others was not acceptable.
After his death, China moved away from Mao's version of communism. However, the influence of the CPC within China remains to this day.