The tree of life is a fundamental widespread myth (mytheme) or archetype in many of the world's mythologies, religious and philosophical traditions. Closely related to the concept of a sacred tree.
The tree of knowledge, connecting to heaven and the underworld, and the tree of life, connecting all forms of creation, are both forms of the world tree or cosmic tree and are portrayed in various religions and philosophies as the same tree.
Various trees of life are recounted in folklore, culture, and fiction, often relating to immortality or fertility. They had their origin in religious symbolism.
The concept of the tree of life appears in the writings of the Bahá'í Faith, where it can refer to the Manifestation of God, a great teacher who appears to humanity from age to age.