Carotenoids are one of the essential phytochemicals with remarkable biological properties. These compounds play a different role in the development of plants and animals. This article reviewsthe structural and functional properties of carotenoids. The review deals with carotenoid chemistry (structure, general properties, etc.), biosynthesis, sources as well as bioactive properties of carotenoids. The article also discusses the role of these constitutive metabolites in radical scavenging and combating various health conditions and chronic diseases.

Keywords: Carotenoids, Antioxidant, Phytochemical, Metabolite, Biosynthesis, Cataract, Free Radical.