In Greek mythology, the underworld or Hades is a distinct realm where an individual goes after death. The earliest idea of afterlife in Greek myth is that, at the moment of death, an individual's essence (psyche) is separated from the corpse and transported to the underworld. In early mythology the dead were indiscriminately grouped together and led a shadowy post-existence; however, in later mythology elements of post-mortem judgment began to emerge with good and bad people being separated.