What is it?
Wallpaper is the pattern, picture or graphic that is your computer's screen background. Your computer screen's icons sit on top of this.
How does it work?
Most computer operating systems allow for the user to choose which background displays on their computer screen, whether it be a pattern or image supplied by the computer operating system such as Windows or Mac OS X, or one uploaded by the computer owner, say of a family photo.
Some networked computers such as school computers have the wallpaper locked so it cannot be changed by the user.
Why is it useful?
Wallpaper is useful to customising your computer with your choices.
What do you need to keep in mind about your child and wallpapers?
If your child has their own computer, or you are happy for them to customise yours, you can usually change the computer's wallpaper through its control panel where various display settings can be found. Some websites also have free wallpaper available for download which are designed to fit your computer's display area (such as 1260x780 pixels).