This book covers linear and nonlinear optics as well as optical spectroscopy at solid surfaces and at interfaces between a solid and a liquid or gas. The authors give a concise introduction to the physics of surfaces and interfaces. They discuss in detail physical properties of solid surfaces and of their interfaces to liquids and gases and provide the theoretical background for understanding various optical techniques. The major part of the book is dedicated to a broad review on optical techniques and topical applications such as infrared and optical spectroscopy or optical microscopy. Discussions of nonlinear optics, but also nano-optics and local spectroscopy complement this self-contained work. Helpful features include about 50 problems with solutions, a glossary and a thoroughly elaborated list of topical references. The book is suited as a text for graduate students but also for scientists working in physics, chemistry, materials or life sciences who look for an expert introduction to surface optical aspects of their studies.