Patterning or lithography is at the core of modern science and technology and cuts across all disciplines. With the emergence of nanotechnology, conventional methods based on electron beam lithography and extreme ultraviolet photolithography become prohibitively expensive. As a result, a number of simple and economically unconventional methods have been introduced, beginning first with research demonstrations in the mid 1990s. This book focuses on these unconventional patterning techniques and their applications to optics, organic devices, electronic devices, biological devices, and fluidics, including commercialization aspects. The book consists of two parts. The first part deals with the principles governing various unconventional patterning techniques. Therefore, the chapters in this part are divided according to the principle involved in the patterning, providing fundamentals. The second part covers applications in various areas, one chapter each for the areas listed above.