Subject
Directories
Another
way to search the Web is by using a directory. A subject
directory is a collection of Web sites selected and organized
by humans, not spiders. Directories are often called subject
trees or hierarchies because they start with a few broad
subject categories (see above) and then divide into increasingly
more specific sub-categories. So, for example, if you are
searching for information on drug treatments for AIDS, you
will proceed through the following progressively narrower
list of options.
| Health |
| |
Diseases
and Conditions |
| |
|
Sexually
transmitted diseases |
| |
|
|
AIDS/HIV |
| |
|
|
|
Research
and Treatment |
| |
|
|
|
|
Drug
Treatment and Therapies |
Many directories also provide a keyword
search option for searching the Web if a search of the directory
is disappointing. Yahoo,
which can be accessed at
http://www.yahoo.com, is
the best known of the commercial subject directories.
