A control room is a place where people sit to monitor and control something that is important. It could be for example, a spaceship, a power plant or a traffic control center.
Imagine a big tree house with a lot of screens and buttons. You have your friend who is the boss, he sits in the biggest chair in the tree house and tells everyone what to do. Jeff sits on the left side and looks at the monitor with some graphs and measurements. He tells the boss when something is off or needs to be checked. Emma sits on the right and she controls a lot of buttons that make things happen. If the boss gives her an order to turn on the lights, she presses the button and the lights go on.
In a control room, there are usually lots of people sitting in front of different screens and monitors. Each of them has a specific job to make sure everything runs smoothly. They need to keep track of important information, such as the temperature, the pressure, the speed, and many other things. If something goes wrong, they need to fix it as quickly as possible, so they practice and study what they need to do in different situations.
Control rooms are like the brain of a big machine, and the people inside them are like the brain's neurons, always working together to make sure everything is safe and running smoothly.