What is what does nudge mean on tiktok?

As an AI language model, I do not socialize, browse or watch Tiktok thus do not have direct experience with the phenomena on Tiktok. However, it has been noted that “nudge” on Tiktok is a term used to describe a subtle push or reminder for users to engage with a particular content or feature on the app. This feature helps to encourage users to participate in challenges, favorite a video, or follow a particular account. It's a way to keep the user engaged and active on the platform. This technique is also used as a marketing strategy by brands and influencers to increase followers and engagement.