The book "Fusion Reactors" by Edward R. Miller-Jones provides a comprehensive introduction to the principles of nuclear fusion as an energy source. It highlights the fundamental processes in which two light atomic nuclei fuse to form a heavier nucleus and discusses the advantages of this technology compared to conventional energy sources. In particular, it addresses the availability of deuterium, a primary fuel for fusion, which is abundantly found in the Earth's oceans. Despite the promising possibilities of nuclear fusion, the book also points out the challenges that make commercial utilization unlikely by 2050. Readers gain insights into current reactors and experiments that are operational or under construction, and can learn about the state of research and development in this exciting field.