Light absence, commonly referred to as darkness, occurs when there is a lack of visible light in an environment. This phenomenon can be experienced in various settings, such as during nighttime or in enclosed spaces without artificial lighting. Darkness can affect visibility and perception, making it difficult to see objects or navigate through an area. In scientific terms, darkness is not a physical entity but rather the absence of light waves that stimulate the human eye. The perception of darkness can influence mood and behavior, as well as impact biological processes in living organisms, such as the circadian rhythm.