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Death is the permanent, irreversible cessation of all biological functions that sustain a living organism. Death is generally applied to whole organisms; the similar process seen in individual components of a living organism, such as cells or tissues, is necrosis.

Something that is not considered a living organism, such as a viruscan be physically destroyed but is not said to die.

As of the early 21st century, overhumans die each day. Many cultures and religions have the idea of an afterlifeand also hold the idea of judgement of good and bad deeds HeavenHellKarma.

The concept of death is a key to human understanding of the phenomenon. Additionally, the advent of life-sustaining therapy and the numerous criteria for defining death from both a medical and legal standpoint, have made it difficult to create a single unifying definition.

One of the challenges in defining death is in distinguishing it from life. As a point in time, death would seem to refer to the moment at which life ends. Determining when death has occurred is difficult, as cessation of life functions is often not simultaneous across organ systems.

This is difficult, due to there being little consensus on how to define life. It is possible to define life in terms of consciousness. When consciousness ceases, a living organism can be said to have died. One of the flaws in this approach is that there are many organisms that are alive but probably not conscious for example, single-celled organisms. Another problem is in defining consciousness, which has many different definitions given by modern scientists, psychologists and philosophers.

Additionally, many religious traditions, including Abrahamic and Dharmic traditions, hold that death does not or may not entail the end of consciousness. In certain cultures, death is more of a process than a single event.

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It implies a slow shift from one spiritual Bg to another. Other definitions for death focus on the character of cessation of something. Historically, attempts to define the exact moment of a human's death have been subjective, or imprecise. Death was once defined as the cessation of heartbeat cardiac arrest and of breathingbut the development of CPR and prompt defibrillation have rendered that definition inadequate because breathing and heartbeat can sometimes be restarted.

This type of death where circulatory and respiratory arrest happens is known as the circulatory definition of death DCDD. Proponents of the DCDD believe that this definition is reasonable because a person with permanent loss of Individuality In Primeval Anger By Selina Hossain and respiratory function should be considered dead. Furthermore, events which were causally linked to death in the past no longer kill in all circumstances; without a functioning heart or lungs, life can sometimes be sustained with a combination of life support devices, organ transplants and artificial pacemakers. Today, where a definition of the moment of death is required, doctors and coroners usually turn to "brain death" or "biological death" to define a person as being dead; people are considered dead when the electrical activity in their brain ceases.

It is presumed that an end of electrical activity indicates the end of consciousness. Suspension of consciousness must be permanent, and not transient, as occurs during certain sleep stages, and especially a coma.

In the case of sleep, EEGs can easily tell the difference. The category of "brain death" is seen as problematic by some scholars.]