Guoan is a term that can refer to various entities, but it is most commonly associated with the Beijing Guoan Football Club, a professional football team based in Beijing, China. Founded in 1992, the club competes in the Chinese Super League and has a strong fan base. The team's colors are green and white, and they play their home matches at the Workers' Stadium. In addition to football, Guoan can also refer to the concept of "national security" in Chinese, emphasizing the importance of safeguarding a nation's interests. This term is often used in discussions related to politics, defense, and international relations.