This book presents best selected papers presented at the 4th International Conference on Emerging Trends and Technologies on Intelligent Systems (ETTIS 2024) held from 27 to 28 March 2024 in hybrid mode at CDAC, Noida, India. The book includes current research works in the areas of artificial intelligence, big data, cyber-physical systems, and security in industrial/real-world settings. The book illustrates on-going research results, projects, surveying works, and industrial experiences that describe significant advances in all of the related areas.