This book contains original, peer-reviewed research articles from 4th International Conference on ICT for Digital, Smart, and Sustainable Development (ICIDSSD 2025), organized by Jamia Hamdard, Delhi, India, during 22&23 April 2025. It includes most recent research trends and advancements in sustainable computing, sustainable energy consumption, governance, sustainability and security, human-built systems for sustainable development, sustainable IoT and cyber physical systems, big data analytics, data science and IoT, cloud computing, and artificial intelligence.