The field of flexible electronics has grown rapidly over the last two decades with diverse applications including wearable gadgets and medical equipment. This textbook comprehensively covers the fundamental aspects of flexible electronics along with materials and processing techniques. It discusses topics including flexural rigidity, flexible PCBs, organic semiconductors, nanostructured materials, material reliability, electronic reliability, crystalline and polymer materials, semiconductor processing, and flexible silicon in depth. The text covers advantages, disadvantages, and applications of processes such as sol-gel processing and ink-jet printing. Pedagogical features such as solved problems and unsolved exercises are interspersed throughout the text for better understanding.