통신 시스템에서 데이터가 오류 없이 성공적으로 수신되었음을 알리기 위해 보내는 확인 응답 신호 또는 문자.
A control character or signal sent by a receiver to a sender to indicate that data has been received successfully.
예문:
"The server waits for an ACK from the client before sending the next data packet."
"If an ACK is not received within the specified timeout, the system initiates a retransmission."
"TCP uses ACK numbers to keep track of which bytes have been successfully delivered."