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♤ Seaweeds are important as food for humans, feed for animals, and fertilizer for plants.
♤ Seaweeds are used as a drug for goiter treatment, intestinal and stomach disorders.
♤ Products like agar-agar and alginates, iodine which are of commercial value, are extracted from seaweeds.
♤ By the biodegradation of seaweeds methane like economically important gases can be produced in large quantities.
♤ Extracts of some seaweed species show antibacterial activity.
♤ Seaweeds are also used as the potential indicators of pollution in coastal ecosystem, particularly heavy metal pollution due to their ability to bind and accumulate metals strongly.