Have you ever played a game where you have to reach a goal by going through different levels? Imagine a computer operating system like that. It has different levels of code that help it do different things, like making your computer work or connecting to the internet.
Well, Plan 9 from Bell Labs is an operating system for computers. It was made by scientists and computer experts at Bell Labs, a big company that does research and development in technology.
Now, what's special about Plan 9 from Bell Labs? Imagine you have a toy car and you want to add some cool new features to it, but you don't want to take it apart and put it back together every time. Plan 9 from Bell Labs is like that toy car. It's a very flexible operating system that lets you add and take away features easily without breaking everything.
Another cool thing about Plan 9 from Bell Labs is that it's designed to work with many different types of computers, including big supercomputers and small hand-held ones. So, you can use Plan 9 on all kinds of devices.
Overall, Plan 9 from Bell Labs is a special operating system that can do many things and work with different types of devices. It's like a toy car that you can add new things to without messing everything up.