The World Wide Web is undoubtedly one of the most important developments of the past decade. Since its beginnings in 1990, it has evolved from a very simple model of resource names (URLs), a transfer protocol (HTTP), and a language for describing interconnected documents (HTML) into a far more complex infrastructure. This book provides a comprehensive technical description of all relevant WWW developments from the beginning to the present day, including the latest versions of the Hypertext Transfer Protocol (HTTP/1.1) and the description language (HTML 4.0), the foundations of the description language (SGML and the emerging variant XML), Style Sheets (CSS1 and CSS2), server technology (SSL, CGI, and Apache as an example of a web server), as well as some developments that will gain importance in the future (MathML, PNG, XPointer, XLink).