TikTok, known in mainland China and Hong Kong[3] as Douyin (Chinese: 抖音; pinyin: Dǒuyīn; lit. 'Shaking Sound'),[4] is a social media and short-form online video platform owned by Chinese Internet company ByteDance. It hosts user-submitted videos, which range in duration from three seconds to 60 minutes.[5] It can be accessed through a mobile app or through its website.

Since its launch, TikTok has become one of the world's most popular social media platforms, using recommendation algorithms to connect content creators and influencers with new audiences.[6] In April 2020, TikTok surpassed two billion mobile downloads worldwide.[7] Cloudflare ranked TikTok the most popular website of 2021, surpassing Google.[8] The popularity of TikTok has allowed viral trends in food, fashion, and music to take off and increase the platform's cultural impact worldwide.[9][10]

TikTok has come under scrutiny due to data privacy violations, mental health concerns, misinformation, offensive content, and its role during the Gaza war.[11][12] While TikTok remains accessible to users in most countries, a minority of countries (including India and Afghanistan) have implemented full or partial bans. Many other countries limit TikTok's use on government-issued devices for security or privacy reasons.[11][13]