Rhodophyta (Red algae)

Rhodophyta, or red algae, are a group of marine algae known for their reddish color, which results from the pigment phycoerythrin that absorbs light efficiently in deep water. They range from small filaments to large, complex seaweeds like nori used in sushi. Red algae play important ecological roles in ocean ecosystems, providing habitat and food for numerous marine species. They also have practical uses in food, cosmetics, and industry due to their unique compounds, such as carrageenan, a thickening agent. Rhodophyta are essential contributors to underwater biodiversity and marine resource sustainability.