Solid-state magnetism has a wide variety of technical applications. This book provides an introduction to the topic and is designed for use by advanced undergraduates in physical and engineering sciences, as well as the practising scientist who needs to know about the theory and current research available in this field. Among the topics covered are the bulk magnetic properties of solid materials and their explanation in atomic terms, the applications of magnetism including NMR imagings and data storage and handling, and modern development including amorphous magnetism and spin glasses.