This text aims to help readers who want to visualize graphs as representing structural knowledge. It gives an outline of the whole field, describes in detail the representative methods for drawing graphs, explains extensions such as fisheye and dynamic drawing, presents many practical applications, and discusses ways of evaluation. It aims to make the intuitive understanding of these easier by using examples and diagrams, and provides references for those readers who wish to know more. This book should be of interest to graduate students, lecturers, practitioners and industrialists in software and knowledge engineering.