This book covers the fundamental science and engineering principles governing radio-frequency (RF) applications and provides a solid understanding of industrial RF unit design options, challenges, and opportunities for development. It explains the similarities, differences, advantages, and limitations of RF and microwave heating; discusses dielectric and thermo-physical properties; provides practical perspectives on industrial RF units used in manufacturing food products; examines RF-heating effects on microorganisms, enzymes, and food quality attributes; and explores RF-heating applications beyond food processing, such as waste treatment and counterfeit prevention.