Urad dal and black lentils are not the same, but they are related. Urad dal is a kind of lentil that is white in color. Black lentils are smaller than other types of lentils, and they have a deep, black color. Both urad dal and black lentils are high in protein and fiber, and they are a good source of iron. They can be used in a variety of dishes, including stews, soups, and curries.