Seaweed, also known as marine macroalgae, is a type of algae that grows in the sea or other saltwater bodies. There are many different types of seaweed, ranging in size from small microalgae to large kelp forests. Seaweed is an important food source for many marine animals, including fish, sea turtles, and whales.

Seaweed is also a popular food item for humans in many countries, particularly in Asian cuisine. It is often used in soups, salads, and sushi rolls. In addition to its culinary uses, seaweed is also used in a variety of other products, including fertilizers, animal feed, and cosmetics.

Seaweed is considered to be a healthy food choice because it is low in calories and high in nutrients, including vitamins, minerals, and antioxidants. It is also a good source of iodine, which is important for thyroid health. In recent years, seaweed has gained popularity as a superfood and has been incorporated into many health foods and supplements.