The aim of this book is to provide in a single volume an updated revision of the most important types of industrial enzymes based on consideration of their physicochemical and catalytic properties, three-dimensional structure, and the range of current and foreseeable applications. The first section of this volume is dedicated to the carbohydrate active enzymes which are extensively used not only in many food industry applications (baking, beverage production, starch processing, etc.) but also in the industrial production of textiles, detergents, paper, ethanol, etc. The second section, on peptidases, begins with an introductory chapter about the MEROPS database which constitutes the current classification of reference for this important group of enzymes, and subsequent chapters review the most industrially relevant types of peptidases. The section on lipases places special emphasis on the increasing application of these enzymes in synthetic processes. Nucleic acid modifying activities are considered in the fourth section. Whilst the nature of the applications and scale of use of the latter are not yet comparable to those of the enzymes considered in the preceding sections, they are of growing in importance given the indispensability of some in highly specialised fields including basic and applied research, medicine, pharmaceuticals, agronomy and forensics. The final section considers a number of important enzymes that cannot be classified into any of the other sections.