Ctrip is an online ticketing service company founded in 1999, headquartered in Shanghai, China. Ctrip has over 600000 member hotels available for booking both domestically and internationally, making it a leading hotel booking service center in China. Ctrip has established branches in 17 cities including Beijing, Tianjin, Guangzhou, Shenzhen, Chengdu, Hangzhou, Xiamen, Qingdao, Shenyang, Nanjing, Wuhan, Nantong, and Sanya, with over 25000 employees. In December 2003, Ctrip successfully went public on NASDAQ in the United States. On March 21, 2018, Ctrip released its customization certification system, and the first customization certification certificate in China was released. On October 29, 2019, Ctrip announced that its English name had been officially changed to "Trip.com Group Limited". On April 16, 2021, it was reported that Ctrip Group was officially listed on the Hong Kong Stock Exchange on April 19.