即时通信(因特网的书写信息实时传递系统)(缩略形式为 IM) Instant messaging is a form of written communication that allows you to send messages from one computer to another. The message appears immediately on the screen of the computer you send it to, provided the computer is using the service. The abbreviation IM is also used. 即时通信(因特网的书写信息实时传递系统)(缩略形式为 IM)