세계수, or the "World Tree," is a significant concept in various mythologies and cultures. It often symbolizes the connection between different realms, such as the heavens, earth, and the underworld. In many traditions, the World Tree serves as a source of life and knowledge, supporting the universe's structure. In Norse mythology, the World Tree is known as Yggdrasil, a massive ash tree that connects the nine worlds. Similarly, in Mesoamerican cultures, the Ceiba tree is considered a sacred tree linking the earth with the sky. These trees represent the interconnectedness of all life and the balance of nature.