The "Java Manual of Style" is a guide that explains how Java can be used for powerful Internet and web programming. It covers what Java is, who can benefit from it, and how to get and set it up. The manual also includes information on creating applets for HTML, Java programming basics, and examples of sound, graphics, and user interface programming with Java. Additionally, it provides a quick reference for compiling, syntax tips, and differences between Java and C/C++. The main goal is to help users understand and utilize Java effectively for various programming tasks.