This book provides an overview on plant innate immunity triggered by peptide elicitors. It explains how peptide signals provide protection against phytopathogens and can act as an eco-friendly crop protectant. The chapters in the book deal with identification and characterization of plant elicitor peptides and their receptors, understanding the process of defense activation conferred by peptide signals, methods of isolation and application. Various new techniques and future strategies are discussed for utilization of these immunity inducers. Molecular and functional characterization of the elicitors will be useful in the development of elicitation-based technology, including large scale production and commercialization. This book serves as an essential resource for researchers and industries working in the field of physiology and biotic stress management of crop plants.