The world wide web (WWW) is a collection of Internet networks that use hypertext, and recently Mosaic, to link together databases, text, files and other network resources. When writing a document on the WWW, it must be written in a special language called HTML, which stands for Hyper Text Markup Language. This unique language enables the user to read a document by simply clicking on a specially marked word to get access to related documents on the web. HTML has expanded to include links to graphics files, sound files and even video files that are available on the net. This introduction to HTML also contains information on the various editors and filters available to compose HTML documents, tips on setting up servers, and a section that shows Mosaic pages with their underlying HTML structure.