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Gills are respiratory organs in aquatic animals such as fish that enable them to extract oxygen from water. They are specialized structures made up of thin, highly vascularized membranes. When water passes over the gills, oxygen is extracted from it and carbon dioxide is expelled. This allows fish to live underwater and survive by obtaining oxygen from the surrounding environment. Gills are efficient at extracting oxygen because they have a large surface area and are richly supplied with blood vessels. The movement of water over the gills is facilitated by the fish's regular swimming or by using specialized mechanisms like pumping or ram ventilation. Overall, gills play a crucial role in ensuring the survival of various aquatic organisms by facilitating gas exchange in water environments.

Some of Gill's main products include fishing apparel, marine clothing, and accessories such as hats, gloves, and sunglasses.