The concept of a tree of life is a widespread mytheme or archetype in the world's mythologies, related to the concept of sacred tree more generally, and hence in religious and philosophical tradition.
The expression Tree of Life was used as a metaphor for the phylogenetic tree of common descent in the evolutionary sense in a famous passage by Charles Darwin (1872).
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, according to the Encyclopædia Britannica, 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 Eternal Banyan Tree (Akshaya Vata) is located on the bank of the Yamuna inside the courtyard of Allahabad Fort near the confluence of the Yamuna and Ganga Rivers in Allahabad. The eternal and divine nature of this tree has been documented at length in the scriptures.
During the cyclic destruction of creation when the whole earth was enveloped by waters, akshaya vata remained unaffected. It is on the leaves of this tree that Lord Krishna rested in the form of a baby when land was no longer visible. And it is here that the immortal sage, Markandeya, received the cosmic vision of the Lord. It is under this tree that Buddha meditates eternally. Legend also has it that the Bodi tree at Gaya is a manifestation of this tree.