What Is ACK?

January 17, 2023

ACK (short for "acknowledgment") is a digital signal sent by the data recipient to the source, confirming that the data was successfully received. The signal usually consists of a single reserved ASCII character. The opposite signal, signifying an unsuccessful data reception, is called NACK or NAK (short for "negative acknowledgment").

Anastazija
Spasojevic
Anastazija is an experienced content writer with knowledge and passion for cloud computing, information technology, and online security. At phoenixNAP, she focuses on answering burning questions about ensuring data robustness and security for all participants in the digital landscape.