Cherry pits are the hard seeds found inside cherries, which are the fruit of the Prunus avium and Prunus cerasus trees. These pits are typically small, oval-shaped, and have a tough outer shell that protects the seed inside. While they are not edible and can be hard on teeth, they play a crucial role in the reproduction of cherry trees by allowing new plants to grow. In addition to their role in nature, cherry pits have some practical uses. They can be dried and used as a filling for pillows or cushions, providing a natural alternative to synthetic materials. Some people also use cherry pits in crafts or as a natural abrasive in cleaning products.