Book excerpt: On a daily basis, our requirements for technology become more innovative and creative and the field of electronics is helping to lead the way to more advanced appliances. This book gathers and evaluates the materials, designs, models, and technologies that enable the fabrication of fully elastic electronic devices that can tolerate high strain. Written by some of the most outstanding scientists in the field, it lays down the undisputed knowledge on how to make electronics withstand stretching. This monograph provides a review of the specific applications that directly benefit from highly compliant electronics, including transistors, photonic devices, and sensors. In addition to stretchable devices, the topic of ultraflexible electronics is treated, highlighting its upcoming significance for the industrial-scale production of electronic goods for the consumer. Divided into four parts covering: * Theory * Materials and Processes * Circuit Boards * Devices and Applications An unprecedented overview of this thriving area of research that nobody in the field - or intending to enter it - can afford to miss.