This book, edited by experts in the area, presents an overview of the different types of dielectric electroactive polymers, covering the basic principles of their main characteristics and functional responses, and their applications. The book emphasizes both the established concepts as well as the most recent advances in materials, processing technologies and applications. The compatibility of several of these polymers with additive manufacturing technologies, allowing improved integration into devices and tailored shapes, is further expanding their areas of application, being particularly relevant in the digitalization of society and industry.