Pixel detectors are an increasingly important class of particle and radiation-detection devices, with a broad spectrum of applications ranging from high-energy physics to biomedicine and material sciences. Thanks to their capability to detect x-rays, pixel detectors are finding an increasing number of applications in areas beyond particle physics. This book is a general-purpose introduction to the fundamental principles of semiconductor-based hybrid-pixel devices. The various aspects of the pixel-detector technology are addressed and examples of existing pixel systems and applications are presented. Pixel Detectors is therefore of benefit to all scientists and engineers working in the field of particle detectors and instrumentation. Book jacket.