Book excerpt: This book provides a general overview of different classes of nanomaterials, which includes the synthesis, fabrication, characterization, properties and technological applications of these materials. The book covers 4 main types of nanomaterials, namely: A) soft nanomaterials, B) biological nanomaterials, C) composite nanomaterials and D) green nanomaterials, where for each nanomaterials, a complete guide to material synthesis, characterization, their unique properties (as compared to a conventional bulk material) and potential technological applications is presented. One of the book's most notable characteristics is the inclusion of a section, a special focus on the future of nanomaterials for next-generation technology in electronic, power and energy devices. The content of this book is presented in a simple and lucid style which can also be used by professionals, scientists and students who are interested in the general research area of nanomaterials technology.