Smart energy systems is an evolving academic concept and interdisciplinary research field focused on the integrated, intelligent management of energy generation, transmission, distribution, and consumption. It investigates the dynamic interactions, optimization strategies, and deployment of advanced digital, communication, and control technologies across the entire energy value chain. Characterized by features such as automation, data analytics, and bidirectional energy and information flow, its significance lies in enabling enhanced efficiency, reliability, resilience, and sustainability necessary for future energy landscapes, including the integration of diverse energy sources and active demand-side participation.