Telegraph: The telegraph was an early form of long-distance communication that used electric signals sent along wires. It allowed messages to be transmitted almost instantly over great distances.
Telephone: The telephone revolutionized communication by enabling real-time voice conversations between distant locations. It replaced the need for written messages or physical transportation for communication purposes.
Internet: The internet is a global network of interconnected computers that allows for the exchange of information and communication across vast distances. It enables instant messaging, video calls, and access to a wealth of information.