The interest in flexible electronics is on the rise as it brings an added functionality and esthetic value in the unconventional interfaces, such as biomonitoring systems, wearables, flexible textiles, paper-based technologies, and many other curves of soft schemes, for which traditional electronics are not suitable. The demand in new flexible platforms turns to a pursuit for functional materials and technologies commonly compatible with a low temperature, high-throughput processing, and novel methods for device integration. A wide range of functional materials involving nanoparticles, composites, semiconductor and metallic nanowires, carbon nanomaterials, polymers, conductive inks, and different hybrid structures are particularly interesting. This book brings a comprehensive overview on the most important technology development in the field of flexible electronics.