 Natural fibers are increasingly being used as reinforcements in polymer composites due to their sustainability and cost-effectiveness. This paper reviews the sources of natural fibers, their properties, modifications, and applications in polymer composites. This article was authored by Yesha Skoda Thayvahali Jirahapa, Sanjay Mavinkar Rangappa, Jyotishkumar Parimaswaran Pillai, and others.