Cctv
In short
A video camera system that sends signals to a specific, limited set of monitors rather than broadcasting to the public.
In plain words
It is a way of using cameras to watch a specific area for security. Unlike normal TV, the video signal is private and only goes to certain screens.
A simple example
A shop owner installs cameras at the entrance to watch for shoplifters. The footage is only viewed by the shop staff on a monitor in the back room.
Why it matters
It helps prevent crime and provides evidence when something goes wrong. It also allows people to monitor remote locations without being there in person.
Easy to mix up
Do not confuse it with broadcast television, which sends signals to anyone with an antenna or receiver.