The "Tree of Knowledge of Good and Evil" is a significant symbol in the biblical narrative found in the book of Genesis. It is described as one of the trees in the Garden of Eden, where the first humans, Adam and Eve, lived. According to the story, God commanded them not to eat from this tree, as doing so would lead to knowledge of good and evil. When Eve was tempted by the serpent, she and Adam ate the fruit from the tree, resulting in their awareness of morality and their eventual expulsion from the garden. This act is often interpreted as the origin of human sin and the loss of innocence.