The term "Underworld" in various mythological traditions refers to the realm of the dead or a place where souls go after death. Different cultures have different interpretations of the Underworld. For instance, in Greek mythology, it is ruled by Hades and is divided into realms like Elysium for the virtuous and Tartarus for the wicked. In Egyptian mythology, it is known as Duat, where souls navigate through challenges after death to reach their afterlife destination. Overall, the Underworld serves as a potent symbol of mortality, judgment, and the afterlife.