The desktop is the work area on a computer screen that simulates the top of an actual desk. The desktop contains the Recycle Bin and icons (shortcuts to programs, files, folders, and various types of documents such as letters, reports, or pictures) that you can arrange just as you'd arrange real objects on a desk.
What is a theme?
Change your desktop background (wallpaper)
Customize the Start menu
Resize the taskbar
Add a toolbar to the taskbar
Change how icons appear in the notification area
Customize desktop gadgets