Lettuce is a leafy green vegetable that is commonly used in salads and sandwiches. It is known for its crisp texture and mild, slightly sweet flavor. Lettuce is low in calories and rich in vitamins and minerals, making it a healthy addition to your diet. There are several varieties of lettuce, including iceberg, romaine, and butterhead, each with its own unique flavor and texture. Lettuce is often used as a base for salads and can also be used as a garnish or added to sandwiches and wraps.