Death is the termination of the biological functions that sustain a living organism. The word refers both to the particular processes of life's cessation as well as to the condition or state of a formerly living body. Phenomena which commonly bring about death include predation, malnutrition, disease, and accidents or intentional trauma resulting in terminal injury.
The nature of death has been for millennia a central concern of the world's religious traditions and of philosophical enquiry, and belief in some kind of afterlife or rebirth has been a central aspect of religious faith. In modern scientific enquiry, the origin and nature of consciousness has yet to be fully understood; any such view about the existence or non-existence of consciousness after death therefore remains speculative.