Morse code is a system of representing letters and numbers using a series of dots and dashes. It was developed in the 1830s and 1840s by Samuel Morse and Alfred Vail, and was first used for telegraphy, a method of communicating over long distances using electrical signals.
The code was later adapted for use in radio communications, and was also used during World War II by military personnel to communicate in the field. Today, while Morse code is no longer widely used for communication, it is still taught to pilots, amateur radio operators, and military personnel as a backup method of communication.