Textbook in PDF format Many atmospheric pressure plasma applications involve interactions with solid or liquid surfaces, such as skin or cell cultures in plasma medicine, or nitrogen fixation in plasma agriculture. Often, the plasma interfaces with a liquid layer. While low-pressure plasma surface interactions are well-documented, studies on atmospheric pressure plasmas at interfaces are limited. This book introduces the physics and chemistry of plasma interactions at solid and liquid interfaces, with a focus on plasma-solid and plasma-liquid dynamics. It also includes a dedicated chapter on the application examples plasma-bio-interactions and pollutant removal. Designed for graduate students and researchers, the book offers a concise, self-contained guide to understanding plasma behaviour at interfaces