The term background can have any of the following meanings:

• Background (computer software) refers to software that is running, but not being displayed.
• Background (astronomy) refers to small amounts of light coming from otherwise dark parts of the sky.
• Background radiation refers to the natural radiation that is always present in a location.
• Cosmic microwave background radiation is a natural constant radiation emanating throughout the universe.
• Background (journalism) is an understanding between a news source and a reporter on the privacy of a discussion.
• Background refers to the part of a scene that appears to be farthest from the viewer
• Background (extra) refers to collective term for the people used in the background of Television, Movie, or other media presentation.
• Background is sometimes used as a synonym for computer wallpaper
• Background lighting is a film technique
• a background is the painted "scenery" in an animated cartoon
• Background independence is a condition in theoretical physics

Background