What you need to know is that these images that you add will neither increase nor decrease the speed of your computer. A desktop wallpaper is highly customizable, and you can give yours a personal touch by adding your images (including your photos from a camera) or download beautiful pictures from the internet.
The background of this screen can be a single colour, multiple colours, or some other graphical representations.
What is a desktop wallpaper? When you boot your computer, there is an initial screen that comes up, in which your folders, documents, and software shortcuts are placed.