The notable invention of the telegraph in relation to communication during the 19th century revolutionized long-distance communication. Invented by Samuel Morse, the telegraph allowed for the transmission of messages across vast distances almost instantaneously, using a system of electrical signals. This technology significantly impacted industries, including journalism and business, facilitating faster information sharing and decision-making. It also played a crucial role during events such as the Civil War, enabling military leaders to communicate rapidly. The telegraph laid the groundwork for future innovations in communication, ultimately changing the social and economic landscape.