This book provides a comprehensive review of key components used in HEVs, including their architectures, advantages, and disadvantages. It explores the choice of bidirectional converters for improved efficiency, the integration ofultracapacitors with batteries to extend battery life, and the role of traction motors in specific applications. The inclusion of photovoltaic cells in HEVs is also discussed, along with various Maximum Power Point Tracking (MPPT) techniques for solar-driven HEVs. The aim is to provide a detailed understanding of these technologies and their suitability for addressing environmental concerns in the automotive industry. By exploring the intricacies of HEV technology, this book provides valuable insights into the advancements and breakthroughs in the field. It offers a comprehensive understanding of the components, architectures, and strategies employed in HEVs, shedding light on the significance of these vehicles fora sustainable future.