The soul is the immaterial essence of a person. Across many cultures it is the part that thinks, feels, chooses, and, in most religious accounts, survives the death of the body.

Greek philosophy gave the Western tradition its classical vocabulary. Plato treated the soul as immortal and pre-existent, temporarily housed in a body. Aristotle saw it as the form of the living body, inseparable from it in this life. Biblical language is less dualistic; the Hebrew nephesh and the Greek psyche often mean the whole living person rather than a detachable entity. Yet both Testaments speak of a life that continues beyond the grave, and Christian theology eventually synthesized biblical hope with philosophical categories.

In Hindu and Buddhist thought the parallel concept is atman or the continuum of consciousness that migrates through rebirths. Some modern materialists deny the soul altogether, reducing mind to brain function. Others defend a non-reductive view in which consciousness cannot be fully explained by physical processes alone.

Whatever the metaphysical status, the word still names the depth dimension of human life—the self that can be lost or found, weighed down or set free. When someone speaks of a soul in anguish or a soul at peace, the language continues to carry weight.