Code talking refers to the use of a native language to create a secure communication system, primarily employed by the Navajo during World War II. This innovative approach involved developing an unbreakable code based on the Navajo language, which enabled military messages to be transmitted quickly and securely in the Pacific Theater. The uniqueness of the Navajo language, along with its complex grammar and vocabulary, made it an ideal choice for creating codes that enemy forces could not decipher.