For Specialized Applications In Today's Modern World, a Variety of Multifunctional Materials With Suitable Mechanical, Thermal, Electrical, and Chemical Properties Are Required. Composites Are a Type Of Material That Offers a Lot of Potential For Developing Multifunctional Innovative Materials That Are Needed For New Technological Developments. Composite Materials Can Provide a Desirable Set of Qualities That Can Be Adjusted to Meet the Unique Requirements For a Given Application By Mixing Two Chemically or Physically Distinct Materials. Traditional Materials Such As Metals, Ceramics and Metal Alloys, Polymers, and Other Materials Cannot Achieve Such a Mix of Qualities. Lately, Polymer Nanocomposites Have Been Making Waves In the Media And In a Variety of Industries. There Has Been a Lot of Interest In Tailoring the Structure and Composition Of Materials on a Nanometer Scale In the Last Several Years. As a Result, a Thorough Examination of The Synthesis, Characteristics, and Applications of Polymer Nanocomposites Is Critical. Polymer Nanocomposites Are Divided into Several Types Based on a Variety of Factors. Sol Gel Process, In-Situ Polymerisation, Solution Mixing Process, Melt Mixing Process, and In-Situ Intercalative Polymerisation Are some of the Preparation Processes. Mechanical, Optical, Rheological, Flame Retardancy, and Dielectric Behaviour of Nanocomposites Have All Been Thoroughly Examined. Finally, the Major Uses Of Nanocomposites As Well As Their Future Prospects ...