This third volume in the series of hot topics from inorganic chemistry covers recent developments in the field of metal clusters, with a total of 21 contributions providing an in-depth view. The result is a unique perspective on solid-state chemistry, illustrating all facets of this interdisciplinary area. With its didactic focus, this volume addresses a wide readership, such that both students and specialists will profit from the expert contributions. Intended to serve as a link between textbooks and research- and data-oriented monographs and handbooks, the Inorganic Chemistry in Focus series tackles more specialized topics, while offering a dedicated approach as well as deeper insights. Dedicated to John D. Corbett upon his 80th birthday, a pioneer and outstanding contributor to this field of inorganic chemistry, many of the authors here are his former students -- highlighting the directions in which they have taken contemporary metal cluster research.