The afterlife, or life after death, are generic terms referring to survivalism, a "continuation" of existence, typically spiritual, experiential, or ghost-like, beyond this world (eg. planes of existence), or after physical death (eg. near-death experience, reincarnation). The major views in this area derive from religion, esotericism, metaphysics, and science. Also there are those with opposite views, such as the materialist-reductionists, who state that the topic is supernatural, therefore does not really exist or is unknowable.
In metaphysical models, theists generally believe some sort of afterlife awaits people when they die. Atheists generally believe that there is not a life after death. However, other atheists like Buddhists, tend to believe in an afterlife like reincarnation but without reference to God.
Agnostics generally hold the position that like the existence of God, the existence of supernatural phenomena, such as souls or life after death, is unverifiable and therefore unknowable. Some philosophies (i.e. posthumanism, Humanism, and often empiricism) generally hold that there is not an afterlife.
We investigate them all . . .