Human computer interaction is a multi-disciplinary field which employs the principles of computer science, media studies, and behavioral sciences. It is concerned with the design, execution and assessment of computer technology. It focuses on the interface between people and computers and is applied wherever there is a possibility of computer installation. The flow of information between a human and a computer is known as loop of interaction. It has several aspects attached to it such as visual based, audio based, input, output, etc. Some of the major areas of focus of human-computer interaction are design of new computer interfaces, implementation of interfaces, evaluation of interfaces and comparison of interfaces. Areas of research within this field include augmented reality, social computing and embedded computation. There has been rapid progress in this field and its applications are finding their way across multiple industries. From theories to research to practical applications, case studies related to all contemporary topics of relevance to this field have been included herein. This book is a vital tool for all researching or studying human-computer interaction as it gives incredible insights into emerging trends and concepts.