Okay kiddo, so imagine you have a toy box full of toys. And each toy has its own little home where it lives in your toy box. The toy box is like your computer, and the toys are like the different programs and files on your computer.
Now, sometimes you want to share your toys with your friends. Maybe you want to let them play with your favorite toy car or doll. So you take it out of its little home in the toy box and show it to your friend.
The Microsoft Personal Web Server is kind of like a toy box for your computer's website. When you go to a website on the internet, it's like visiting someone else's toy box and looking at their toys.
If you want to create your own website and show it to your friends, you can use the Microsoft Personal Web Server to keep all of your website's toys in one place (kind of like how your own toy box keeps all your toys together). It lets you keep all of your website's files organized and ready to share with other people who want to visit your website.
So basically, it's a special program that helps you make a website and share it with other people. Pretty cool, huh?