The tree of life is a common idea in cultures throughout the world. It represents, at times, the source of life, a force that connects all lives, or the cycle of life and death itself. Common features of various myths include supernatural guardians protecting the tree and its fruits that grant those who eat them immortality. It is typically planted at the centre of the world, often within a sacred garden or forest. The tree of life is closely related to both the world tree, a motif found across many cultures that is typified by the Norse belief in the sacred tree Yggdrasill, and the tree of knowledge, which was said to grow in the Garden of Eden in Abrahamic religions