The Shanghai Metro () is a rapid transit system in Shanghai, operating urban and suburban transit services to 14 of its 16 municipal districts and to Huaqiao Town, Kunshan, Jiangsu Province. Opening in 1993 with full-scale construction extending back to 1986, the Shanghai Metro is the third-oldest rapid transit system in mainland China, after the Beijing Subway and the Tianjin Metro. It has seen substantial growth, significantly during the years leading up to the Expo 2010, and is still expanding quickly, with its most recent expansions having opened in January 2021. It is the biggest component of the Shanghai metropolitan rail transit network, together with the Shanghai maglev train, the Zhangjiang Tram, the Songjiang Tram and the China Railway-operated commuter rail services to Jinshan. The metro system is also integrated with other forms of public transport in Shanghai.