In Norse mythology, Yggdrasil is the cosmic world tree, connecting the Nine Realms. It symbolizes the interconnectedness of all life and serves as a meeting point for gods, humans, and creatures. The tree represents balance and cycle of life, death, and rebirth, while its roots and branches explore the themes of destiny and fate. Yggdrasil's health reflects the state of the universe, and its protection is crucial for the order of existence, making it a central element in Norse cosmology.