Dark or Darkness is the perceived absence of light. Contrary to popular belief, pure or total darkness
does not exist, because some small amount of light particles, in the form of radiation, permeate every
corner of the universe, even if undetectable to the human eye at times. So, darkness is best described as
"less amounts of light," rather than "the absence of light." True darkness is only theoretically possible in
conditions of absolute zero. Earlier in history, it was sometimes viewed as a substance in its own right,
and appears in this form in some fantasy literature.