This book will describe the laser-plasma interactions mostly driven by ultra-short ultra-intense lasers, including electron acceleration, ion acceleration, and generation of radiations. Laser-plasma particle acceleration and radiation sources are intensively pursued due to their possibility to overcome the current limitation of linear accelerators and synchrotron sources. Currently, the operation of large-scale laser facilities, such as three pillars of extreme light infrastructure (ELI) in Europe, facilitates the investigation of laser-plasma interactions in new regimes. Therefore, the demand for comprehensive studying material to enter the research area of modern laser-plasma interactions is getting high, but there are not many books on this topic. This book can be beneficial for students and young scientists to understand the principle of laser-plasma interactions and design their experiments. Key Features: Comprehensive description for an emerging field of laser-plasma accelerators and radiations A practice book for laser-plasma interactions Instructions for beginners in laser-plasma science The perspective of future technologies based on laser-plasma sources Includes Animation on high power laser operation, Video for visualizing plasma waves Animation on the high-order harmonic generation process and Animation on laser particle accelerations.