A background color fills the backdrop of an image, webpage, document, or other graphical element. It provides the canvas on which other elements like text, images, or graphics are displayed. Background colors enhance the visual appeal of content, provide contrast, and contribute to the overall design aesthetic.
In 3D rendering, the background color is the color that fills the image or scene areas where there's no geometry or where the scene goes beyond visible objects. This color, appearing in the image's background, significantly influences the rendered scene's overall appearance and atmosphere.