The Apple of Eden is the powerful artifact sought in the Assassin's Creed series.
It is one of the Pieces of Eden, advanced artifacts created by the Isu, an ancient civilization that existed before recorded human history in the series' mythology. Apples can influence human perception and behavior, making them valuable to both the Assassins and the Templars.
The artifact is especially important in the first Assassin's Creed game, where Altaïr encounters one during his missions. Apples also appear in later stories, but they are not the only type of Piece of Eden in the franchise.
The Apple of Eden is often confused with the Staff of Eden or the Sword of Eden. Those are separate artifacts with different forms and story roles. The word “Apple” identifies this particular spherical Piece of Eden.