Radio Communication: The use of radio waves to transmit messages over long distances. It allowed for real-time communication between military units during World War II.
Telegraph System: An earlier form of long-distance communication that used electrical signals to transmit messages. While not as advanced as radio communication, telegraphs played a role in coordinating actions during the war.
Encryption: The process of encoding information to make it secure from unauthorized access. Encryption techniques were used by both sides during World War II to protect sensitive communications from being intercepted by enemy forces.