This book intends to report the new results of the study of bacteriocins, from basic research to application fields. It mainly introduces the biological characteristics of bacteriocins, the relationship between their structure and function, the antibacterial mode of action, and their application as antibacterial agents in food industry, medical care, and other areas, especially their application potential in human health. This book can be used as a reference book for researchers, undergraduates, and graduated students in the professional fields of food science and engineering, bioengineering, medicine, and agriculture.