The underworld is highly significant in Egyptian mythology, notably in relation to the god Osiris. Osiris governs the afterlife, symbolizing death, resurrection, and judgment of souls. His story encompasses themes of betrayal, death, and the quest for rebirth, embodying the ancient Egyptians' views on life beyond mortality. The underworld is a place of transformation where souls undergo trials, reinforcing the belief in immortality. Osiris's association with the afterlife reflects the importance of the afterlife in Egyptian culture, emphasizing moral conduct during life to attain favorable judgment.