Known as Douyin in China, Tik Tok is a music video and social media app. The app lets you shoot and edit short clips, then add music and special effects to them. Tik Tok is owned by the same parent company that bought social video app Musical.ly for $1 billion last year.
According to Sensor Tower, Tik Tok has become a "total phenomenon" in China in recent months. In the first quarter of 2018, the app was downloaded an estimated 45.8 million times.