The paper by Giudice and Rattazzi reviews theories with gauge-mediated supersymmetry breaking, which provide an alternative to scenarios where soft terms of low-energy fields are induced by gravity. These theories naturally suppress flavor violations in the supersymmetric sector and have distinctive phenomenological features. The authors discuss the basic structure of these models, their experimental implications, and attempts to embed them into models where all mass scales are dynamically generated from a single fundamental scale. The paper covers the structure of models with gauge-mediated supersymmetry breaking, including the building blocks, soft terms, and physical mass spectrum. It also explores the phenomenology of these models, such as the properties of the lightest supersymmetric particle (the gravitino), the next-to-lightest supersymmetric particle, signals in collider experiments, searches in low-energy experiments, and gravitino cosmology. Additionally, the paper discusses the origin of the μ and Bμ parameters and the mechanisms for dynamical supersymmetry breaking. The authors emphasize the predictive power of these theories and their potential to address the naturalness problem in the Standard Model.The paper by Giudice and Rattazzi reviews theories with gauge-mediated supersymmetry breaking, which provide an alternative to scenarios where soft terms of low-energy fields are induced by gravity. These theories naturally suppress flavor violations in the supersymmetric sector and have distinctive phenomenological features. The authors discuss the basic structure of these models, their experimental implications, and attempts to embed them into models where all mass scales are dynamically generated from a single fundamental scale. The paper covers the structure of models with gauge-mediated supersymmetry breaking, including the building blocks, soft terms, and physical mass spectrum. It also explores the phenomenology of these models, such as the properties of the lightest supersymmetric particle (the gravitino), the next-to-lightest supersymmetric particle, signals in collider experiments, searches in low-energy experiments, and gravitino cosmology. Additionally, the paper discusses the origin of the μ and Bμ parameters and the mechanisms for dynamical supersymmetry breaking. The authors emphasize the predictive power of these theories and their potential to address the naturalness problem in the Standard Model.