The textbook "Virtual Reality Technology and Applications" offers a comprehensive introduction to the world of virtual reality. It is aimed at both students and professionals who wish to understand the diverse aspects of this technology. The content ranges from the mathematical and technological foundations of virtual worlds to the human factors and applications that enrich our lives, particularly in the fields of medicine, entertainment, and education. After a brief introduction to the topic, kinematic and dynamic mathematical models are discussed, followed by an analysis of how computers can track and interpret human movements. The book highlights the various modalities that make up a virtual world, including visual, auditory, and haptic elements. Additionally, it examines the interaction between real and virtual environments as well as the design principles of the virtual world. The work concludes with a look at different applications, with a particular focus on augmented reality. Although the content is primarily oriented towards VR, it is also relevant to many other areas.