Telegraph | Invention, History, & Facts britannica.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from britannica.com Daily Mail and Mail on Sunday newspapers.
Telegraph, any device or system that allows the transmission of information by coded signal over distance. The term most often refers to the electric telegraph, which was developed in the mid-19th century and for more than 100 years was the principal means of transmitting printed information.