Acknowledgement Code

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What Does Acknowledgement Code Mean?

An acknowledgment code (ACK) is a type of unique signal that a computer sends to show that data
has been transmitted successfully. The acknowledgement code is an ASCII
character that has been designated to serve as a signal between sender and


An acknowledgment code is also known as an acknowledgment

Techopedia Explains Acknowledgement Code

The acknowledgement code illustrates the ways that various
senders and receivers handle blocks of data. There is a certain protocol or
familiar size for a data block, to which the sender data must conform. When the
recipient gets the right data block, it sends the acknowledgement code back
to the sender, and then the sender sends another block. This iterative process
helps ensure that large amounts of data get delivered from a sender to a receiver


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Margaret Rouse
Technology Expert
Margaret Rouse
Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.