Are you also wondering what a background is?
Usually a background is a computer-generated image. Backgrounds are there in many colors and beautiful designs. There are also many backgrounds in 3D. Backgrounds can be made for different reasons for example; as a christmas tree,for in a powepoint or just to practice. About practice a lot of people make some backgrounds just to practice for web designing, or they try out their new programs. Also sometimes it will happen that people change existing images from design or from color. There are also designers who merge two backgrounds with each other in order to make something new. Most of the time they use the famous program photoshop for that but there are many different programs to use. If you like to make or design some backgrounds also than watch some trailers on youtube first and than try it out!