Mourning is the emotional expression in response to a major life event causing grief, especially loss. It typically occurs as a result of someone's death, especially a loved one. The word is used to describe a complex of behaviors in which the bereaved participate or are expected to participate, the expression of which varies by culture. Wearing black clothes is one practice followed in many countries, though other forms of dress are seen. Those most affected by the loss of a loved one often observe a period of mourning, marked by withdrawal from social events and quiet, respectful behavior in some cultures, though in others mourning is a collective experience. People may follow religious traditions for such occasions. Mourning may apply to the death of, or anniversary of the death of, an important individual such as a local leader, monarch, religious figure, or member of family.