The book "Size Exclusion Chromatography" provides a comprehensive introduction to the technique of size exclusion chromatography (SEC), which has established itself as one of the most commonly used methods for determining the molecular weight distribution of polymeric materials. In recent years, SEC has significantly evolved, particularly regarding column and detector technologies, as well as new application areas. These advancements allow for the determination of not only the absolute molecular weight but also the conformation and size of polymer chains, as well as their branching and properties in solution. The book places special emphasis on the practical aspects of SEC, including the selection of columns and mobile phases, calibration, and the latest detector features. It is aimed at both beginners in the field and experienced researchers looking to deepen their knowledge.