Acknowledgement Definition, What is Acknowledgement

In computing, an Acknowledgement is a signal passed between communicating processes or computers to signify acknowledgement, or receipt of response, as part of a communications protocol. For instance, Acknowledgement packets are used in the Transmission Control Protocol during establishment and termination of connections.

Short for acknowledgement, ACK is a response given by another computer or network device indicating to another computer that it acknowledged the SYN/ACK or other request sent to it.