Instant messaging (IM) is a kind of online chat which offers real-time text transmission over the Net. A LAN messenger operates in a similar way over a local area network. Short messages are usually transmitted bi-directionally between parties, when each user chooses to complete a thought & choose "send". Some IM applications can use push know-how to provide real-time text, which transmits messages character by character, as they are composed. More advanced instant messaging can add file transfer, clickable hyperlinks, Voice over IP, or video chat.
Non-IM types of chat include multicast transmission, usually often called "chat rooms", where participants might be anonymous or might be historicallyin the past known to each other (for example collaborators on a project that is using chat to facilitate communication). Instant messaging systems tend to facilitate connections between specified known users (often using a contact list also often called a "buddy list" or "friend list"). Depending on the IM protocol, the technical architecture can be peer-to-peer (direct point-to-point transmission) or client-server (a central server retransmits messages from the sender to the receiver).
Non-IM types of chat include multicast transmission, usually often called "chat rooms", where participants might be anonymous or might be historicallyin the past known to each other (for example collaborators on a project that is using chat to facilitate communication). Instant messaging systems tend to facilitate connections between specified known users (often using a contact list also often called a "buddy list" or "friend list"). Depending on the IM protocol, the technical architecture can be peer-to-peer (direct point-to-point transmission) or client-server (a central server retransmits messages from the sender to the receiver).
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