It is the opposite of birthday. It is a custom in several Asian cultures, including Armenia, Cambodia, China, Georgia, Hong Kong, Taiwan, India, Myanmar, Iran, Israel, Japan, Bangladesh, Korea, Nepal, Pakistan, the Philippines, Russia, Belarus, and Vietnam, as well as in other places with significant overseas Chinese, Japanese, Jewish, Korean, and Vietnamese populations, to observe the anniversary on which a family member or other significant individual died. There are also similar memorial services that are held at different intervals, such as every week.