TikTok is a social media platform where users can upload short videos. Posts that are popular on TikTok often become trending, which means that they're being discussed a lot by people on the platform. This can happen for a variety of reasons, like when a popular user posts a new video or when a topic or trend begins to gain traction. If a post becomes trending, it can increase the visibility of the user who created it and the content itself. In many cases, TikTok will start to pay its creators for their posts that become popular on the platform.