This book, written by an expert in the field with a worldwide reputation, outlines the developments in radar and its applications during the past 100 years. Special attention is paid to the Italian and German contributions, which tend to be neglected in the scarce international literature. The entire historical period up to the present day is considered, with documentation of all significant events since the issue of the first patent to Christian Hulsmeyer in 1904. Information is also provided on the exceptional people who have made possible the development of this technology. The book is divided into ten chapters and is organized in such a way as to be easily read by both non-specialists and specialists in the field of radar and related areas. Additional information is provided in the form of appendices, supplementary material on the internet, and many footnotes, and more than 250 photos and drawings are included.