海草, or seaweed, refers to various types of marine plants and algae that grow in ocean waters. These organisms play a crucial role in marine ecosystems, providing habitat and food for many marine species. Seaweed can be found in different forms, including green, brown, and red varieties, and is often classified based on its color and structure. In addition to its ecological importance, 海草 is also widely used in culinary dishes, particularly in Asian cuisine. It is rich in nutrients, including vitamins and minerals, making it a popular ingredient in foods like sushi and soups. Furthermore, seaweed is utilized in various industries, such as cosmetics and pharmaceuticals, due to its beneficial properties.