TikTok, the popular social media platform for short-form videos, assigns a unique User ID (UID) to each account. This 19-digit numerical ID serves as an identification code for users and helps TikTok track and organize content and user data. The unique ID can be found by going to your profile, clicking on the three dots in the top right corner, and selecting "Privacy and Settings." From there, go to "Account" and then "My Account." You will see your unique TikTok ID listed under your username.