Morse code is a type of code that is used to send telegraphic information using rhythm. Morse code uses dots and dashes to show the alphabet letters, numbers, punctuation and special characters of a given message. When messages are sent by Morse code, dots are short beeps or clicks or flashes, and dashes are longer ones.
Morse code is named after Samuel Morse, who helped invent it. It is not used as much today as it was in the 19th and 20th centuries, because there are now other types of technology that are easier to use to communicate. However, some people still use Morse code to communicate on amateur radio. Many people do this as a hobby.
The signal for help is S.O.S sent by Morse code. People can send Morse code by flickering lights.