What is background?
background meaning in Information Science terminology / glossary / dictionary is:
In pictorial art, the parts of a scene that appear to lie in the distance, behind figures and objects in the foreground. In illuminated manuscripts, the background in a miniature can be undecorated, diapered, or foliate, with or without gilding, as in the preceding examples from a Gospel book and a Bible historiale (Getty Museum, MS 65 & 1). In the late Middle Ages, miniatures were often painted against a naturalistic background, as in this miniature from Des Cas des Nobles by the Boucicaut Master (Getty, MS 63).