Collard greens are a leafy vegetable that belongs to the Brassica family, similar to kale and cabbage. They have large, dark green leaves that are thick and slightly bitter in taste. Collard greens are commonly used in Southern cuisine and are known for their nutritional value, being rich in vitamins A, C, and K, as well as fiber and calcium. They can be cooked in various ways, such as steaming, sautéing, or boiling, and are often used in dishes like soups, stews, or as a side dish.