Pie Chart of Different search engines
Working of search engines
Architecture of a Search engine
Best & Quick Search
Advanced search techniques of Google
Search Engine Market
The very first tool used for
searching on the Internet
was Archie. The name
stands for "archive"
without the "v".
Around 2000, Google’s
search engine rose to
Archie was created in
1990 by Alan Ematage
, Bill Heelan and J. Peter
Deutsch, computer science
students at McGrill
University in Montreal.
By 2000, Yahoo! was
services based on
Inktomi's search engine
Yahoo! switched to Google's
search engine until
2004,when it launched its
engine based on the
combined technologies of its
A web search engine is designed to search for
information on the World wide web and FTP servers.
The search results are generally presented in a list of
results and are often called hits.
The information may consist of web pages, images,
information and other types of files.
Some search engines also have mine data available in
databases or open directories.
Unlike web directories, which are maintained by human
editors, search engines operate algorithmically or are a
mixture of algorithmic and human input.
Today there are many search engines.
e.g. Google, Yahoo, Aol, Safari, msn etc.
Today Google at the top in search engine. The reason is
its creativity only.
High-level architecture of a standard Web crawler
• Data about web
pages are stored in
an index database
for use in later
• The purpose of an
index is to allow
information to be
found as quickly as
• When a user enters a
query into a search
engine the engine
examines its index
• provides a listing of
pages according to
• The index is built
from the information
stored with the data
and the method by
• Unfortunately, there
are currently no
known public search
engines that allow
documents to be
searched by date.
Most search engines
support the use of the
AND, OR and NOT
Most search engines
employ methods to rank
the results to provide the
"best" results first.
The usefulness of a
search engine depends
on the relevance of the
result set it gives back.
Some search engines provide
an advanced feature called
proximity search which
allows users to define the
distance between keywords
queries allow the user
to type a question in the
same form one would
ask it to a human. A
site like this would be
A Web crawler is a computer program that browses the World
Wide Web in a methodical, automated manner or in an orderly
This process is called Web crawling or spidering.
Web crawlers are mainly used to create a copy of all the visited
pages for later processing by a search engine that will index the
downloaded pages to provide fast searches.
Crawlers can also be used for automating maintenance
tasks on a Web site, such as checking links or validating
Spiders take a Web page's content and create key search words
that enable online users to find pages they're looking for.
SEARCH ENGINE WORKS
• Web Crawling
• Storing Information
• Retrieval from Html pages itself
• An automated Web browser
• Contents of each page are analyzed to determine how it
should be indexed
Architecture of a Search Engine
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Use words called Boolean
operators to link key words
and phrases. These Boolean
AND, OR, and NOT.
Is your hit list too
small, or you get no
hits at all? Try using the
word OR between related
words or synonyms.
AIDS OR HIV AND
France AND Statistics
If you want AIDS
AIDS AND France
Renaissance in Europe, but
you keep getting sites on
Renaissance NOT Harlem
It built its
at a time.
At its peak
ns to web
open at a
in order to
looked at an
Search engine market
Most Web search engines are commercial
ventures supported by advertising revenue
and , as a result , some employ the practice of
allowing advertisers to pay money to have
their listings ranked higher in search results
Some search engines which do not accept
money for their search engine results make
money by running search related ads
alongside the regular search engine results.
The search engines make money every time
someone clicks on one of these ads