This book offers a comprehensive overview of the rapidly developing field of cluster science. In an interdisciplinary approach, basic concepts as well as recent developments in research and practical applications are authoritatively discussed by leading authors. Topics covered include 'naked' metal clusters, clusters stabilized by ligands, clusters in solids, and colloids.The reader will find answers to questions like:* How many metal atoms must a particle have to exhibit metallic properties?* How can the large specific surface of clusters and colloids be employed in catalysts?* How can metal clusters be introduced into solid hosts?* Which effects are responsible for the transition from isolated to condensed clusters?The editor has succeeded in bringing the contributions of various authors together into a homogeneous, readable book, which will be useful for the academic and industrial reader alike.