This book presents the proceedings of 4th EAI International Conference on Smart Technology ***(***MTYMEX), which took place March 28-29, 2024, Vancouver, B.C., Canada. MTYMEX is an international conference aimed at demonstrating the potential of new applications for the Internet in the future. The authors offer perspectives on research on smart technologies in society, including the results of research projects on virtual reality, block chain, artificial intelligence, and smart cities. The book offers examples of applications with smart technologies in different knowledge areas. The conference brings together the academic, research and private sectors working on applications and smart devices for e-health and smart cities.