Bonjour a tous is a standard French greeting meaning hello everyone, commonly used to open lessons, broadcasts, videos and public talks in French-speaking settings. This short recording circulates on soundboards under the name Mono, with no confirmed original video, speaker or programme reliably documented. Its appeal online is its simplicity: a familiar phrase, delivered clearly, that anyone can recognise as a welcome. Creators reuse it as a reusable intro button for streams, edits and chat reactions, where it signals the start of something rather than delivering a punchline or reference that needs explaining.