Prunes, formerly known as PLUMS, are dried fruits that have been around for centuries. They were originally used as a way to preserve the fruit for longer periods of time and were popular in Europe during the Middle Ages. Prunes are made by drying out PLUMS and removing the pits, resulting in a sweet and chewy snack. Prunes are high in fiber and contain many essential vitamins and minerals, making them a healthy snack option.