Investigations into conducting polymers have been thorough due to their remarkable characteristics, such as adjustable electrical properties, outstanding optical and mechanical properties, simple synthesis and fabrication processes, as well as superior environmental stability when compared to traditional inorganic materials. The synergistic benefits of utilizing conducting polymer composites have enabled them to be widely implemented in the electrical, electronics and optoelectronic industries. This chapter provides an explanation about the conduction mechanism, methods of synthesis, properties and applications of conducting polymers like polyacetylene, polyaniline, polypyrrole, polythiophene etc. Microwave conductivity and the mechanism of electrical conduction in conductive polymers and conductive rubber blends are also discussed.