Book excerpt: In the past three decades our understanding of the clustering behavior of nucleons in both nuclear structure and nuclear dynamics has evolved considerably. Moreover, the notion of the cluster has made its way into a number of scientific disciplines.This book provides an overview of the current understanding of clustering phenomena in nuclear structure and nuclear dynamics. The topics covered include: fundamental aspects of nuclear clustering, models of nucleon clusterization, clustering aspects of nuclear structure, selected topics on clustering aspects in medium- and high-energy nucleus-nucleus collisions.