This book covers a wide range of studies in the field of Solid State Fermentation (SSF). The work begins with a collection of useful definitions followed by contributions on biomass estimation and the kinetics of fungal growth on solid substrates. Key articles are included on engineering and SSF reactor design and agro-industrial waste upgrading, followed by papers on enzyme technology by SSF processes and secondary metabolites and biopesticides. The book concludes by considering the latest SSF applications. This book will be useful to academic and commercial researchers and students interested in a wide variety of aspects of SSF. We hope that readers will be stimulated by those questions raised and will discover enough answers to consider SSF processes as one of the many alternatives in the rapidly developing biotechnology sector.