Okay, imagine you want to send a message to your friend who lives far away. But how will you do that? You cannot shout it out loud because your friend cannot hear your voice from miles away. So, a long time ago, people invented a thing called a telegraph to send messages over long distances.
A telegraph is like a magic box that you can use to send messages over a wire. Remember how you can talk to your friend on the telephone by holding the receiver in your hand and speaking into it? A telegraph also has a hand-held device called a telegraph key that you can use to send messages by tapping on it.
When you tap the telegraph key, it sends electrical signals through a wire to another telegraph far away. The signals are translated into a message using a code called Morse Code. Morse Code is like a secret code, and it uses dots and dashes to represent letters and numbers. For example, a dot can represent the letter 'E,' and a dash can represent the letter 'T'.
When the message reaches the other end of the wire, it is decoded back into letters and words and then written down.
So, if you want to send a message to your friend using a telegraph, you'd tap out the letters and numbers on the telegraph key, and the signals would travel over the wire to your friend's telegraph, where they would be converted back into letters and numbers. Pretty cool, right?