Asynchronous computer-mediated communication

Asynchronous conferencing or asynchronous computer-mediated communication (asynchronous CMC) is the formal term used in science, in particular in computer-mediated communication, collaboration and learning, to describe technologies where there is a delay in interaction between contributors. It is used in contrast to synchronous conferencing, which refers to various "chat" systems in which users communicate simultaneously in "real time".

Source: Wikipedia — Asynchronous computer-mediated communication (CC BY-SA 4.0)