Telegraphy Is The Long-Distance Transmission ?of Messages Where The Sender Uses Symbolic ?Codes ?

For the vast majority of human civilization, the scope of day-to-day conversational privacy ‎had pretty much been whatever was beyond earshot. But the rise of the telegraph meant that ‎the possibilities of communication exploded; by the mid-19th century you could go to a ‎telegraph station and have a message sent further and faster than had ever been possible. ‎The whole idea of what was "beyond earshot" changed inexorably.‎