Automatic Repeat reQuest

Automatic Repeat reQuest (ARQ) is a method used in digital communication systems to ensure data is transmitted accurately. When data is sent from one device to another, the receiver checks for errors. If the data is correct, it sends back an acknowledgment; if not, it requests a retransmission. This process continues automatically until the data is received correctly. ARQ helps maintain data integrity and reliability in networks, such as internet connections and mobile communications, by detecting errors and efficiently managing retransmissions without human intervention.