Seaweeds are actually algae. Rockweed, kelp, sea lettuce and dulse are all well-known seaweeds. More than 25000 species of plants are classified as algae. Sea weeds are consumed in many European societies. Although many of the large, familiar seaweeds are shades of brown, there may be yellow, purple, pink and deep violet.
Seaweeds come in all shapes and sizes. Seaweeds around the world are a diverse and varied group. Most have a root like holdfasts at their bases, which enable them to cling to rocks and other surfaces and so withstand pounding surf and changing tides. The branching fronds of some, like rockweed are subdivided into segments resembling true leaves, and many are equipped with air bladders that keep the fronds afloat.
Seaweed is a source of iodine. It also helps to improve the digestion activity. Different sea weeds are known to have different health benefits. They are even taken after a brief illness as they are found to be rich in essential minerals and vitamins.