Telecommunication is transmitting of signals, words sounds etc by electromagnetic, radio or wire systems
Interesting, I've always wondered how my radio worked!
telecommunications occur when information is exchanged between people through technology
Wasn't the telegraph the first use of telecommunications?
In early days of communication they used smoke signals, semaphore telegraph, signal flags etc
I never thought of smoke signals as "telecommunications" 
Other early methods included loud whistles, coded drumbeats and lung blown horns
I think drums as communication is really interesting. I would like to learn more about that?
communication usually involve electrical and electromagnetic technologies, such as telegraph, telephone, and teleprinter, networks, radio, microwave transmission, fiber optics, and communications satellites.
A revolution in wireless communication began in the first decade of the 20th century with the pioneering developments in radio communications by Guglielmo Marconi, who won the Nobel Prize in Physics in 1909, and other notable pioneering inventors and developers in the field of electrical and electronic telecommunications. These included Charles Wheatstone and Samuel Morse (inventors of the telegraph), Alexander Graham Bell
Telecommunication
Telecommunication is the transmission of signs, signals, messages, words, writings, images and sounds or information of any nature by wire, radio, optical or other electromagnetic systems.
Telecommunication occurs when the exchange of information between communication participants includes the use of technology. It is transmitted through a transmission media, such as over physical media, for example, over electrical cable, or via electromagnetic radiation through space such as radio or light. Such transmission paths are often divided into communication channels which afford the advantages of