Zara is not just a brand-it is a system. Behind its ever-changing shop windows and collections lies one of the most profound industrial transformations in the fashion sector: a model that integrates design, production, logistics, and distribution into a single operating cycle.This book does not dwell on the commercial surface, but on the infrastructure that enabled Inditex to grow into the world's leading fast-fashion group. From its Galician origins and the entrepreneurial vision of Amancio Ortega, it traces the construction of an ecosystem able to connect stores to headquarters in real time, turning every outlet into a market sensor and every signal into a production decision.The analysis highlights how vertical integration, systematic data collection, and compressed lead times allowed Zara to rewrite the rules of the industry-minimizing unsold stock and making speed a true competitive advantage. The result is a case study that goes beyond fashion, offering concrete insights for anyone operating in unstable markets and facing rapidly shifting demand.