Imagine you have a desk in your room where you keep your toys and books. You can see your desk, and you know how to use it to find things you need. Your computer works in the same way but instead of physical things like toys, it has virtual things like files or programs.
Your computer also has a desk - it's called the desktop. This is where you can see all the virtual things stored on your computer. You know how to use your physical desk, and similarly, the desktop works the way you know. The desktop has a background image or color that forms the base of it.
You can see small pictures on the desktop, called icons. These icons stand for files or programs, like the icon of a book stands for the book on your desk. Just like you can pick up your toy from your desk, you can click on the icon on the desktop to open the file or program it represents.
Another feature of the desktop is the taskbar, which is like a list of your favorite things that you can access quickly. You can open your favorite toy box or book, similarly, with the taskbar on the desktop, you can open your favorite programs quickly.
So in essence, the desktop is a way to see and access all your virtual things stored on your computer, making it easier for you to use it by comparing it to your physical desk at home.