Dunaliella is a genus of microalgae known for its ability to thrive in high-salinity environments, such as salt lakes and salt flats. These unicellular organisms are often green or reddish in color due to the presence of carotenoids, which help protect them from intense sunlight and UV radiation. This microalga is significant in biotechnology and nutrition, as it is a rich source of beta-carotene, a precursor to vitamin A. Dunaliella is also studied for its potential applications in food supplements, cosmetics, and biofuels, making it an important organism in both ecological and commercial contexts.