The book explores the fundamental science, recent developments, and future prospects of ionic polymers as key enablers of smart material systems. It provides a comprehensive understanding of their chemistry, structure–property relationships, and diverse applications in modern engineering, healthcare, robotics, and energy devices. The work covers the interdisciplinary research efforts in materials science, robotics, biomedical engineering and electronics. It demonstrates energy harvesting and storage capabilities of ionic polymers and uniquely addresses how ionic polymers can be used for flexible capacitors and self-powered sensors, crucial for next-gen wearable electronics and IoT. Theoretical understanding and practical insights. Valuable resource for any students and researchers seeking in-depth knowledge on ionic polymer-based smart technologies.