Polymers are a novel class of materials consisting of many small molecules (monomers) that can be linked together to form long chains, thus they are basically macromolecules. A special feature of most of the polymers, which distinguish them from metals, is their inability to carry electricity. It is a general view that plastics and electrical conductivity are mutually exclusive. However, during last two decades, a new class of organic polymers has been derived with unique ability to conduct electrical current. This class of materials is called as ¿synthetic metals¿. Many of these conductive materials have been widely adored and under extensive research for practical applications, such as rechargeable batteries, electrolytic capacitors and biosensors. They have tremendous potential for future scientific and technological development. Classification of polymers Polymers can have different chemical structures, physical properties, mechanical behavior, thermal characteristics etc. Depending upon their origin, it is possible to classify polymers as natural, synthetic and conducting polymers and their application discussed very well.