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?
More modern methods include telephone, networks, radio, printer, fiber optics etc