Deep
Web Engine Also known as an "invisible web" engine,
a deep web engine is capable of searching for sites, files, or databases
that are usually "hidden" from basic search engines because of coding
that may prevent the engines from indexing them or from linking to the
web sites.
When
searching for hidden information, or sites that may contain statistics,
documents, or articles in pdf format. This type of engine
is useful when you are looking to exhaust your possibilities and
when you're simply not finding much else on your topic.
