Sea lettuce is a type of green algae known scientifically as Ulva lactuca. It typically grows in coastal areas and can be found attached to rocks or floating in shallow waters. Sea lettuce has a bright green color and a leafy, thin texture, resembling a salad leaf. This algae is often harvested for culinary uses, particularly in Asian cuisine, where it is used in salads, soups, and sushi. Sea lettuce is also rich in nutrients, including vitamins A, C, and K, as well as minerals like iodine and calcium, making it a healthy addition to various dishes.