All of us are familiar with the term wallpapers but we usually associate it with the walls of the room i.e. a material used to cover or decorate the walls of the room. Here we will talk about the computer wallpapers which decorate the walls of the computer i.e. desktop.  
 
Here is a proper description of the term wallpaper which is a desktop picture and desktop background which is referred to as an image used as a background on a computer screen, usually for the desktop of a graphical user interface. "Wallpaper" is the term used in Microsoft Windows before Windows 7 (where it is called the Desktop "Background"), while in Mac OS X it is referred as a "desktop picture" (in the past, the term desktop pattern was used to refer to a small pattern that was repeated to fill the screen).

What type of images are used as wallpapers?  The type of images used as computer wallpaper are usually raster graphics with the same size as the display resolution (for example 1024×768 pixels, or 1280×1024 pixels) in order to fill the whole background.

In order to create dynamic pages, adobe Flash can also be used in these cases (and interactive) wallpapers as well by setting the wallpaper to an HTML file with an embedded Flash image. It is also important to know that Microsoft Windows Vista Ultimate also has the ability to use a video as a wallpaper and Microsoft Windows 98 through XP allowed webpages to be set as frames on the desktop which may be dynamic pages. There is an option for the users that they can either choose to use their own home videos which loop continuously, or use one already installed in the system.

The most interesting thing about wallpapers is that you can download these wallpapers for free without paying even a single penny and this does not take long.   

If you are looking for the websites which offer listing of the sites that offer free wallpapers then the best thing is to use appropriate keywords in the search engines. You can easily find such sites which offer complete listing of the sites that offer wallpapers for free. Some desktop wallpapers feature images of animals, cars celebrities, movies, vehicles, sports, and so many other images. You can search wallpapers by themes which is the best way to find your favorite desktop wallpaper without wasting your time.    

Its your choice what look you want to give to your desktop, and you can change it daily too if you want as the options and choices are endless. The choice is yours but the variety of options are available on the web, waiting for your click, so lets see what clicks you.