Kale and spinach are two types of leafy green vegetables that are both highly nutritious and popular in many dishes. Kale is a member of the cabbage family and is known for its high levels of vitamins A, C, and K, as well as minerals like calcium and iron. Spinach is a dark green vegetable that is rich in vitamins A, C, E, and K, as well as magnesium, potassium, and iron. Both kale and spinach are low in calories and can be eaten raw or cooked.