1950s Horror Film with Basil Rathbone, Lon Chaney, Jr
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, accidents resulting in terminal injury, and disease. Death of an entire species is known as extinction. Human activity has increased the number of extinctions in recent times, one cause, for example, being the destruction of ecosystems as a consequence of the spread of industrial technology.
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 belief. 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.