This book provides an overview of polypyrrole synthesis by different methods such as chemical polymerisation, lecetro-polymerization, photo-initiated polymerization and γ irradiated polymerisation. Pyrrole derivatives play a crucial role in organic chemistry, medicinal chemistry, and heterocyclic chemistry. Pyrrole scaffold is extensively used in the synthesis of drug molecules with various pharmacological properties, as well as in material sciences. The authors review studies on the electrical properties of hybrid polymers which revealed that their electrical conductivity increased markedly with the proportion of pyrrole in the initial mixture. This is attributed to the formation of an electrically conducting polymer network in the non-conducting methacrylate matrix. Lastly, the recent developments in polypyrrole and polypyrrole-based composites materials in the applications of electromagnetic wave absorption are summarized in detail. In particular, the authors focus on the design and fabrication of polypyrrole -based composites and explore the significant impact of electromagnetic parameters on the electromagnetic wave absorbing properties.