Within European Union Data Spaces projects, use cases play a key strategic role, as they demonstrate the concrete value and practical impact of data sharing across sectors and borders. They translate policy objectives and technical frameworks into real-world applications, showcasing how secure, interoperable, and trusted data exchange can drive innovation, competitiveness, and societal benefits. Well-defined use cases also help validate the Data Spaces architecture, engage stakeholders, and ensure alignment with EU priorities such as digital sovereignty, sustainability, and the data economy.