Lentils are a type of legume, which is a plant-based food that is high in protein and fiber. They are small, round, and come in a variety of colors, including green, brown, and red. Lentils are a staple in many cultures around the world and are often used in soups, stews, and curries. They are also a great source of vitamins and minerals, making them a nutritious and delicious addition to any meal.