The document discusses different types of search engines. It describes crawler-based search engines which use software programs like spiders to access webpages and add them to a database. It provides examples of popular search engines like Google, Yahoo, and Ask Jeeves. The document also covers directories, specialty search engines, hybrid search engines, and meta search engines. It explains the differences between these types and provides examples of search engines that fall under each category.

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 It is basically a type of program that uses
keywords to search for documents that
relate to these keywords and then put the
results found in the order of relevance to
the topics that was searched for :
Example:
Google
Alta vista

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 Search engine are important because with over 8
billion web pages available, it would be impossible
to search for the information that is specifically
needed. This is why search engine are used to
filter the information that is on the internet and
transform it into results that each individual can
easily access and use within the matter of
seconds.

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 Crawler based search engines
 Directories
 Specialty search engines
 Hybrid search engines
 Meta search engines

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 Are search engines that use software programs
that are called, “Spiders”, “crawler”, “Robots”,
“Bots”. These programs can access the webpages to
categorize and analyze them and then add them in
the search engine data base, where any user can
find them when searching. The crawler based
search engines are constantly updated with new
page that would be available in their data base.

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 Google began in January 1996 as the research project
 Founded by Larry Page and Sergey Brin.
 Most popular search engine
 Google’s homepage include a button labeled “I’m feeling
lucky”. When user type in search and click on the button the
use will be taken directly to the first search result.
 Beside the main search engine feature of searching for
text, Google search has more than 22 “ special features like:
weather, unit conversion, etc.

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 In January 1994, Jerry Yang and David Filo, Stanford
university graduates, created a website called “David and
jerry’s Guide to the wild wide web”, in Sunnyvale, California.
 In April 1994, “David and Jerry’s Guide to the world wide
web” was renamed to “Yahoo!”
 Yahoo! Provides internet communication service such as:
Yahoo! Messenger and Yahoo! Mail.
 Yahoo! Offers social networking services such as my Web,
Yahoo! Personals, and Flickr.

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 A question and answer focused search engine.
 Founded in 1998 by Garrett Gruener and David
Warthen in Berkeley, California

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 Are website sectioned in specific categories by human
editors and are than placed in the “Directories:
database.
 Example:
* Yahoo Directory (www.yahoo.com)
* Open directory (www.dmoz.org)

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 They help the user search in different areas in
specific types of lists that are specialized in specific
topic that would be beneficial for narrowing down the
searching process.
 Examples:
*Askjeeves (Question and answer search engine)
* Medhunt (Provides only medical information)

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 Are search engine that use both crawler based
searches and directory searches to obtain their
result
 Example
* Yahoo.com
* google.com

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 Are search engine that Combine all the result from
other search engines into one big list
 Example
* Metacrawler
* Dogpile

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 Boolean searches use the “Boolean
operators” to combine word and make the
search topic more specific and limited for
the user.

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 And is equal to the + symbol
 Not is equal to the – symbol
 OR means that the search engines automatically
return to the words that you type in.
 Near is equal to putting quotes for a specific
phrase search as “Shakespeare sonnets”

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