In Norse mythology, the three roots of Yggdrasil, the World Tree, represent different realms: Asgard, Midgard, and Hel. Each root connects to a significant aspect of existence - the gods, humanity, and the dead. This sacred tree illustrates the interconnectedness of creation, symbolizing the unity between the celestial, terrestrial, and underworld realms. Yggdrasil serves as a cosmic axis, emphasizing the balance and harmony within the Norse worldview.