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Definition of IM

(Instant Messenging)- A program that allows you to ‘chat’ live via keyboard over the internet. Both parties must be running the same IM software - there are several different brands, mostly incompatible with each other.

Computer Science

Other definitions of IM

Pertaining to a message sent in real time through a network to a private chat area.

Computer Science

A message sent in real time through a network to a private chat area.

Computer Science

A method of real-time communication over the Internet in which a sender types a message to one or more recipients and the recipient immediately receives the message in a chat area.

Computer Science