Xie xie ni is the standard Mandarin expression for thank you, made up of words for thanks and you, and it is taught in almost every beginner Chinese lesson. Because the phrase is short, familiar and easy to recognise, short audio versions circulate widely as reaction sounds, language clips and polite sign-offs in short-form video. Creators use it to acknowledge support without switching language for a long explanation, and its friendly, everyday meaning keeps it useful across gaming, streaming and social posts.