Death is a biological phenomenon, define as the permanent and irreversible cessation of all biological functions of a being. Many people are afraid of discussing, thinking, or planning their own deaths because of we do not know about death and why death occur. If we know what is death we can think for planning our life, preparing a will, or deciding whether we will remain home or seek help before death. Moreover, after death, we transfer to another world passing out along with funeral according to religious. People seek help to religious cleric, as there is vast information regarding death in religion. As the death is the inevitable system and part and percale of life, therefore we must aware of what death is. We need do good deed in term of one day we will die and after death we will be nowhere but our benevolent works remain and may make us eternal or we will be rewarded heaven or hell or transmigrate to a new body according to our conduct.