Most web indexes not only display a list of resources, but allow the user to link directly to the resource. There are two ways. Generally, search engines employ the use of special software which searches the web for information. When the user enters a keyword, the search engine attempts to match web documents which contain the same word. Web directories usually involve some type of human intervention.
People actually search the web and identify sights that fit under various subjects.
When the user enters a keyword, the index matches it with a subject heading and displays var ious websites which fit under the specified subject. Webliography InterNic 15 Minute Series. An on-line Internet dictionary. NNLM Internet Information Center. Provides a wealth of resources for health sciences librarians.