Simplify the following text for a Grade 8 native English-speaking person.
Original: Morse 's original code specification , largely limited to use in the United States and Canada , became known as American Morse code or railroad code .
Simplified: 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 .