The book presents a forward-thinking and interdisciplinary collection of research contributions that seamlessly integrate technological innovation with the principles of sustainability. The core purpose of the book is to foster dialogue and collaboration focused on building intelligent, secure, and environmentally responsible computing systems. As the digital landscape rapidly evolves, ICSDC 2025 addresses the critical need for advanced distributed and intelligent technologies that align with global sustainable development goals.A prominent feature of ICSDC 2025 is its emphasis on Digital Twin technologies. These virtual counterparts of physical systems allow for continuous monitoring, simulation, and lifecycle management of assets. They are increasingly being adopted in sectors such as industrial automation, infrastructure development, environmental monitoring, and healthcare. By providing real-time feedback and scenario modeling, digital twins promote more informed decision-making and efficient use of energy, materials, and human resources. The conference is deeply aligned with the vision of Industry 5.0, which emphasizes human-centric design, ethical AI, and intelligent automation. ICSDC 2025 highlights innovations that prioritize sustainability, resilience, and collaboration between humans and machines. Topics such as federated learning, cyber-physical systems, and context-aware computing are featured prominently, showcasing the potential of emerging technologies to enable a more inclusive and sustainable industrial future. The book includes research on low-power computing architectures, green AI models, edge intelligence, privacy-preserving mechanisms, and secure distributed systems.The intended audience of ICSDC 2025 includes academic researchers, industry practitioners, system architects, and policy decision-makers who are working at the intersection of technology and sustainability. It serves as a strategic reference point for those seeking to design, implement, and scale digital ecosystems that are not only smart and secure but also equitable, human-centric, and environmentally sustainable.