This book aims to provide a cohesive knowledge on the interdisciplinary fields of entomology and nematology. It discerns the current progress of these fields and highlights some of their key concepts and applications for further research and observations. It includes some of the vital pieces of work being conducted across the world, on various topics related to morphology and physiology of insects and nematodes, taxonomy and forensic entomology, etc. The extensive content of this book provides the readers with a thorough understanding of the subject for all the graduate and post graduate students, researchers, etc.