Search Engines, Subject Directories/Indexes & Multi/Mega Engines
Search Engines, Subject Directories/Indexes & Multi/Mega Engines
Index words or terms in web documents
Are programs run on a particular web site
Search large portions of the Internet based on
information that their "bots" retrieve or on information submitted by users who
want their sites included in the search database
Spiders or robots are
automated search programs that go through the web and search web pages for keywords.
The information that bots return is used to match web pages to keywords and
key phrases requested by users
Provide more complete search results of available pages on the web
Are usually smaller than search engines
Directories classify Web documents or locations into an arbitrary subject classification scheme
Are usually compiled by hand or in some type of logical order
Begin with a top-level subject and narrow topics to a specific website
Usually only include sites listed in a specific database
Indexes like Yahoo only search their own databases, not large portions of the web like search engines
Provide limited search results of available pages on the web
Doesn't create its own database of information
Searches the databases of other engines
Allows the user to search several search engines simultaneously
Search databases of other search engines
**Information located from subject directories/indexes will not be as wide as the information located from a search engine. However, the information collected from subject directory/index will contain more specific information dealing with a particular subject matter. Search engines provide a larger amount of possibilities; subject directories/indexes findings are narrower.
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