Okay kiddo, so imagine you have a toy computer that can do all sorts of things like play games, help with homework, and even draw pictures. Now imagine that there was a real computer back in the olden days called the Acorn computer. The people who used the Acorn computer were called Acorn users. They used this computer to do all sorts of things like write stories, do math problems, and even create cool graphics.
The Acorn computer was special because it had a unique operating system called RISC OS that made it faster and more efficient than other computers at the time. Acorn users loved this computer because it was easy to use and had lots of software and accessories created just for it. They even had their own magazine called Acorn User that they could use to learn more about the computer and get tips and tricks on how to use it better.
In summary, Acorn users were people who used a special kind of computer called the Acorn, which was loved for its unique operating system and vast array of software and accessories.