International Conference on Science and Technology (ICST 2021) is a scientific forum to discuss the development and latest research on exact science, engineering and technology. The following topics of third conference are Science and Engineering physics, Mathematics and Statistics, Electrical and Electronics, Computer Science, Control and Robotics, Smart City and Internet of Things, Architecture and Environment, Biological and Environmental Physics, Geophysics, Geology and Mining, Chemistry and Chemical Engineering, Biomedics and Biometrics, Mechanical Engineering, Industrial Engineering, Civil Engineering, Science Education. Technology-based applications such as learning media for education can also be accepted at this Conference. Selected papers that have been reviewed will be published in E3S Web of Conference indexed by Scopus.