This text focus on the latest advances in the field of optical vortices, from fundamentals to applications. The book begins with the basic knowledge in the field of optical vortices, including the characteristics of optical vortices, generation methods, and orbital angular momentum detection methods. Then, several important types of optical vortices are introduced, including partially coherent vortex beams, vector vortex beams and spatiotemporal optical vortices. Lastly, the applications of optical vortices are introduced systematically, including in optical trapping, optical communications, imaging, and metrology.