- About Search Engines
- Individual Search Engines
- Meta Search Engines
- Academic and Professional Search Engines
- Deep Web Search Engines
Bare Bones 101: A Basic Tutorial on Searching the Web
How Search Engines Work
Invisible Web: What It Is, Why It Exists, How to Find It, and its Inherent Ambiguity
LLRX.com - MetaSearch Engines
Web Searching Tips
Unlike individual search engines, meta search engines do not own databases of web pages. Meta search engines are web sites that simultaneously search databases maintained by other individual search engines and/or web directories to get their listings. After collecting the results, meta search engines remove duplicate links and combine the search results into a single merged list.
Directories are collections of Internet sites organized by subject. Users click on a topic of interest and then browse through the list of resources in that category. Directories are constructed and maintained by human beings, rather than by the automated computer programs used to create search engines.
Best of the Web
100 Time-Saving Search Engines for Serious Scholars
Deep Web Search Engines
The deep web (or invisible web or hidden web) is the name given to web pages that cannot be indexed or crawled by traditional search engines. These pages often link to databases on websites that can only be retrieved if they are searched from within the sites themselves. Some deep websites restrict database access to members or subscribers; some limit access to their pages. Although traditional search engines cannot retrieve content from the deep web, it is estimated that 95% of the deep web can be accessed through specialized searches.