Cherries are the most popular fruits. Cherries are small, pitted fruits that come in a variety of colors and flavors. Cherries are a good source of vitamin C, potassium, fiber, and other nutrients that your body needs.The tart and juicy cherries seem to be more effective than the sweet varieties.Cherries are a delicious way to protect your heart. Eating cherries or drinking tart cherry juice can help improve the quality of your sleep.