The book "Molecules in Interaction with Surfaces and Interfaces" offers a comprehensive analysis of the interactions between molecules and surfaces and interfaces. It addresses the fundamental aspects of adsorption and catalysis on solid surfaces, as well as the complex properties of molecules at liquid interfaces. Additionally, it explores the relationship between structure and functionality in macromolecular biological systems. The aim of this work is to present the methodological achievements and current progress in this research area in an accessible manner. The diversity of topics and the comprehensive approach are intended to help non-expert readers navigate this exciting field of research.