https://www.theguardian.com/technology/2021/feb/11/clubhouse-app-invite-what-is-it-how-to-get-audio-chat-elon-musk

The exclusive invitation-only social networking app is a hybrid of conference calls, talkback radio and Houseparty

Part talkback radio, part conference call, part Houseparty, Clubhouse is a social networking app based on audio-chat. Users can listen in to conversations, interviews and discussions between interesting people on various topics – it is just like tuning in to a podcast but live and with an added layer of exclusivity.