If you are fascinated about Unmanned Aerial Vehicles (UAVs), particularly Quadrotors, this book covers an inevitable starting point for you as it takes you through the theory of conventional (under-actuated) Quadrotors up to the status quo, which holds answers to future questions. For robotics enthusiast, here's an even more exciting piece of over-actuated Quadrotor called the Tiltrotor Quadrotor in which additional inputs are used to tackle wind gusts disturbances while decoupling motions. Versatilities of Quadrotors are amazingly breaking boundaries in numerous application areas. Consequently, promising ideas such as fleet designs or multi-agent tasks are still open for exploration by utilizing tiltrotor design.