Key telephone system

A key telephone system is a type of phone system that has special buttons called "keys" that let you do different things. For example, there might be a key for making a call, a key for answering a call, and a key for putting someone on hold.

The key telephone system is kind of like your toy phone at home, but much bigger and more complicated. It has lots of buttons and wires that go all over the place to make sure you can talk to other people on the phone.

In the olden days, people used these key telephone systems a lot because they didn't have cell phones or computers like we do today. Even though they are not used as much anymore, some businesses still use them to help their workers communicate with each other.

Overall, a key telephone system is like a really big toy phone that grown-ups use to talk to each other so they can get their work done.