From a technical standpoint, asynchronous communication involves a physical layer transmission technique in which the sender's clock and recipient's clock are independent of one another. From a user perspective, it means that a conversation takes place intermittently over time. A telephone conversation is a synchronous form of communication -- both parties are active at the same time. E-mail is asynchronous: You can send a message to a recipient who may not know about the message until hours or days later and may wait even longer to respond. Instant messaging is synchronous but online social network status updates are asynchronous.
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