Laser-induced graphene (LIG) is a revolutionary technique that uses a common CO2 infrared laser scriber found in machine shops for the direct conversion of polymers into porous graphene under ambient conditions. This technique combines 3D graphene preparation and patterning into a single step without the need for wet chemicals, and it has become one of the main pathways for graphene device preparation due to its advantages. The ease in structural engineering and the excellent mechanical properties of LIG have made it a versatile technique for applications across many fields. This book compiles cutting-edge research in LIG from different research groups all over the world, including the strategies that have been developed to synthesize and engineer LIG, and its applications in varied fields. The authors of this book are pioneers in the discovery and development of LIG and the book will appeal to anyone involved in nanotechnology, chemistry, devices, and environmental sciences, especially those with an interest in graphene materials synthesis and applications.