Telephonie
In short
Telephonie is the technical process of transmitting sound through a telephone network to allow voice communication over long distances.
In plain words
It is the way your voice is turned into electrical or digital signals. These signals travel through wires or airwaves to reach another person's device.
A simple example
When you dial a number on your mobile, the network uses telephonie to connect your voice to your friend's handset.
Why it matters
It allows people to communicate instantly regardless of where they are in the world. It forms the backbone of modern social and business connections.
Easy to mix up
Do not confuse it with telephony, which is the broader industry or system of telephone communications.