Chlorophyta, commonly known as green algae, is a diverse group of photosynthetic organisms primarily found in freshwater, marine, and terrestrial environments. They are characterized by their green color, which comes from chlorophyll pigments. This group includes unicellular and multicellular forms, ranging from microscopic phytoplankton to large seaweeds. Green algae play a crucial role in ecosystems as primary producers, converting sunlight into energy through photosynthesis. They contribute to oxygen production and serve as a food source for various aquatic organisms. Some species of Chlorophyta are also used in research and biotechnology for their potential applications in biofuels and environmental sustainability.