An apple seed is the small, hard seed found inside an apple, which is the fruit of the apple tree (Malus domestica). Each apple typically contains several seeds, which are brown and flat in shape. These seeds are essential for the reproduction of the apple tree, as they can grow into new trees when planted in suitable soil. Apple seeds contain a compound called amygdalin, which can release cyanide when metabolized. However, the amount of cyanide in a few seeds is very small and generally not harmful if consumed in moderation. It is important to note that eating large quantities of apple seeds can be dangerous.