https://www.cnet.com/news/galaxy-s9-animoji-3d-emoji-report/

Animoji uses your face to bring emojis to life.

The Galaxy S9 may come with a 3D emoji feature, Korean news outlet ETNews reported. The feature works by scanning your face and creating a 3D character that mimics your fine-tuned facial movements and expressions, says the report. You could also send these 3D emojis in place of normal ones in messages.