These are technologies for the transfer of information via electrical or light technologies.

Common examples are:

  • Visual Light communications ( fires, flashes of light, smoke signals)
  • Radio and TV communication
  • Telegraph communications
  • Telephone communicationsĀ (partly superseded converged by the , or evolving into theĀ internet)

Telecommunication is communication at a distance by technological means, particularly through electrical signals or electromagnetic waves. Due to the many different technologies involved, the word is often used in a plural form, as telecommunications.

Early telecommunication technologies included visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs.[7] Other examples of pre-modern telecommunications include audio messages such as coded drumbeats, lung-blown horns, and loud whistles. 

Electrical and electromagnetic telecommunication technologies include:

  •  telegraph,
  •  telephone, and teleprinter, 
  • networks, 
  • radio, 
  • microwave transmission, 
  • fiber optics, communications satellites and 
  • the Internet.