In today's modern world, extensive research has been performed to apply new materials to various components. However, it is necessary to use those materials that have been tried and tested. With stiff competition in the market, industrialists are keen to use tailor-made materials to provide a cutting edge to their product. Out of all the materials available worldwide, composites can be tailor-made to satisfy one's needs. Therefore, compounds have played a pivotal part in the revolution of the material industry. Composites have high durability, power to mass ratio, increased efficiency. These things have made composites an integral part of the aerospace, automobile, and defense sectors. In bio-composites, carbon fiber composites and glass fiber composites have been used to reduce cost and energy consumption. Natural fibers traditionally used as fillers have now been extensively used as reinforcements in bio-composites. The adoption of green technology aids in overcoming environmental pollution challenges. It can achieve sustainable development by substituting petroleum-based composites with bio-based composites. This review discusses the various commonly used matrices and biopolymers in Green Composites. The article highlights characterization techniques and suitable processing techniques that are used to manufacture green composites.