Sheol came to be thought of as a place of waiting, where a person’s soul could either be purified and sent on to Gan Eden or sent for punishment in Gehenna. Jews understand this to mean that ...
People sometimes ask: “Does Judaism believe in hell?” Not really. Judaism does have a belief in Gehenna, a place where really bad sinners go after death to become purified of their sins.
It is the Jewish equivalent of the Christian Heaven. Gehenna developed as an idea of a place of punishment for those who had lived immoral lives. It is the Jewish equivalent of the Christian Hell.