An input/output control system is like a helper that helps your computer or phone know what you want it to do.
Think of it like your mom or dad who helps you get dressed in the morning. They ask you what clothes you want to wear and then help you put them on. Similarly, an input/output control system helps your device "get dressed" by providing a way for you to give it commands (input) and receive information back (output).
For example, when you type on the keyboard, the input/output control system processes the words and letters you type and sends them to the computer to display on the screen. And when you click on an app, the system helps your device know which app you want to open and then displays the information you need from that app on the screen.
Overall, the input/output control system acts like a helpful assistant that makes it easier for you to interact with your device and get things done.