search engine

2.  A search engine is a service that indexes,
organises and often rates and reviews the
website. It is basically type of program that uses
keyword to search for documents that relate to
these keyword and then puts the result found in
the order to relevance to the topic that was
searched for.
 Examples :-
 Google
 Yahoo

3.  Most search engine can be successfully completed
with the use of good search engine and the
correct search word. Search engines for the
general web do not really search the world wide
web directly. Each one searches a database of the
full text of web pages selected from the billions
of web pages out of their residing on servers.
When we search the web using a search engine,
we are always searching a somewhat stale copy of
the real web page. When we click on links provided
in a search engines search result, then we
retrieve from the server the current version of
the page.

4.  Crawler based seearch engine
 Directories
 Hybrid search engine
 Meta search engine
 Free-text Query search engine

5.  Are search engine that use software program
that are called, “Spiders”, “Crawlers”, “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 webpages that
would be available in their database.
 Examples :-
 1. Google
 2. Yahoo
 3. Ask.com

6.  Google began In januaray 1996 as a research
project.
 Founded by Larry Page and Sergey Brin.
 Most popular search engine
 Google Inc. owned and operated
six Google Modular Data Centers
across the U.S., One in Chile,
One in Finland, One in Ireland,
One in Belgium, One in Singapore
and One on Taiwan.

7.  Yahoo was founded by Jerry Yang and David
Filo in January 1994.
 Yaiceshoo full coverage lets us browser
categories of news, where articles and resources
have been hand-assembled by Yahho editors.
 Yahoo! provides internet
communication services
such as Yahoo! Messenger
and Yahoo! Mail.

8.  Ask.com (originally known as Ask Jeeves) is
a question answering-focused web search
engine founded in 1995 by Garrett
Gruenerand David Warthen in Berkeley, California.
 The original software was implemented by Gary
Chevsky from his own design.

9.  Depend on the human factor where editors review
the web page, the ones with good evaluation reach
the directories and are scrolled through during a
search.
 These directories are notupdated automatically
unless reviewed.
 Example :-
 A good example of a directorise is yahoo!
 Open directory (www.dmoz.org)

10.  The hybrid search engine are search engines with
a related directory.
 Most of the search engine are moving in this
direction.
 This is because they want to appeal to both kinds
of users beginners and advanced users.
 Example :-
 Yahoo.com
 Google.com

11.  Meta search engine are programs that search a
number of search engines at the same time.
 Theoretically, they provide the best result
because they search across various engines at the
same time
 These engines sometimes result in too many
matches that could possibly overhelm the user.
 Example :-
 Metacrawler
 Dogpile

12.  Accept the query in the form of a text question
and hence ensures specific result.
 The strength of these search engines is that they
provide a kavel of comfort to the user because
the user interacts ina question and answer
approach just like another human being.
 Example :-
 The best example of this is ask jeeves.