The branch of physics which is intended for a particular practical or technological use is termed as applied physics. It is rooted in the fundamental concepts of the physical sciences but focuses on the utilization of scientific principles in actual devices and systems. It functions as a bridge between physics and engineering. Applied physics contributes significantly towards technological advances such as the development of electronics and photonics. It is also involved in the improvement of practical investigations such as experimental particle physics and experimental nuclear physics. Some of the other major research areas where applied physics is used are microscopy, semiconductors, electromagnetic propulsion and lasers. This book discusses the fundamentals as well as modern approaches of applied physics and technology. It will also provide interesting topics for research which interested readers can take up. This book will help the readers in keeping pace with the rapid changes in this field.