Algae are microorganisms which are found in aquatic habitats such as rivers, lakes, ponds, and oceans and can photosynthesize. Microalgae are unicellular microscopic algae that live in marine and freshwater. Microalgae are important for life on earth, as they perform photosynthesis which helps in reducing the concentration of carbon dioxide in the atmosphere. They convert sunlight, carbon-di-oxide, and water to algal biomass. Microalgae can be a rich source of bio-products such as proteins, vitamins, lipids, pigments, and antioxidants among others. They have a wide range of applications in dietary supplements, pharmaceuticals, food and beverages, and cosmetic & personal care.