This book is aimed at designers and researchers dealing with radar and EW systems who want to understand, explore, and make use of microwave photonics concepts. It is also aimed at researchers and engineers in photonics who want to have a complete picture of the systems where their components or chips might be used. Specifically, the book discusses: the structure and figures of merit of radar systems and EW systems, building blocks of microwave photonics (underlining the potentials of each described photonics-implemented function), recent examples of photonics-based radar systems, general concepts and figures of merit of radar networks (or netted radars), examples of radar networks implemented with standard RF technologies and highlighting their limitations, the potentials of very recent implementations of photonics-based coherent radar networks, examples of photonics in EW systems, and an analysis of the past and future of photonics in radar and EW systems from an industrial viewpoint.