This book comprises the proceedings of ICITCS 2021. It aims to provide a snapshot of the latest issues encountered in IT convergence and security. The book explores how IT convergence and security are core to most current research, industrial, and commercial activities. Topics covered in this book include machine learning & deep learning, communication and signal processing, computer vision and applications, future network technology, artificial intelligence and robotics, software engineering and knowledge engineering, intelligent vehicular networking and applications, health care and wellness, web technology and applications, Internet of things, and security & privacy. Through this book, readers gain an understanding of the current state-of-the-art information strategies and technologies in IT convergence and security. The book is of use to researchers in academia, industry, and other research institutes focusing on IT convergence and security.