The document discusses search engines and their components. It provides a brief history of search engines including Archie, Google, and Yahoo. It then describes the key components of search engines such as web crawlers that retrieve web pages, an indexer that builds indexes of words on pages, and a search function that returns results based on user queries by matching them to indexes. The document also discusses Google's crawling architecture and how it indexes pages. Finally, it notes that most search engines are commercial and make money through advertising.

1. Presented BySwati Singh
MCA(5th sem)

2.  Pie Chart of Different search engines
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History
Introduction
Working of search engines
Web crawlers
Architecture of a Search engine
Best & Quick Search
Advanced search techniques of Google
Search Engine Market

3. .

4. 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
prominence.
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
providing search
services based on
Inktomi's search engine
Yahoo! switched to Google's
search engine until
2004,when it launched its
own search
engine based on the
combined technologies of its
acquisitions.

5.  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.

6. 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.

7. High-level architecture of a standard Web crawler

8. • Data about web
pages are stored in
an index database
for use in later
queries
• The purpose of an
index is to allow
information to be
found as quickly as
possible.
• When a user enters a
query into a search
engine the engine
examines its index
• provides a listing of
best-matching web
pages according to
its criteria
• The index is built
from the information
stored with the data
and the method by
which the
information is
indexed
• Unfortunately, there
are currently no
known public search
engines that allow
documents to be
searched by date.

9. Most search engines
support the use of the
boolean operators
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
Natural language
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
ask.com.

10.  A Web crawler is a computer program that browses the World
Wide Web in a methodical, automated manner or in an orderly
fashion.
 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.

11.  Crawlers can also be used for automating maintenance
tasks on a Web site, such as checking links or validating
HTML code.
 Spiders take a Web page's content and create key search words
that enable online users to find pages they're looking for.

14. SEARCH ENGINE WORKS
OPERATIONS
• Web Crawling
• Indexing
• Searching
WORKS
• Storing Information
• Retrieval from Html pages itself
WEB CRAWLEER
• An automated Web browser
• Contents of each page are analyzed to determine how it
should be indexed

15. Architecture of a Search Engine
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Search
Indexer
The Web
Indexes

16. Use words called Boolean
operators to link key words
and phrases. These Boolean
operators are:
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.
example
AIDS OR HIV AND
France AND Statistics
If you want AIDS
statistics in
France, type:
AIDS AND France
AND statistics
Renaissance in Europe, but
you keep getting sites on
the Harlem
Renaissance, type:
Renaissance NOT Harlem

17. Google
began as
an
academic
search
engine.
It built its
initial
system to
use
multiple
spiders,
usually 3
at a time.
At its peak
performanc
e,its system
can crawl
over 100
pages per
second
, generating
around 600
kilobytes of
data each
second
Each
spider
could keep
300
connectio
ns to web
pages
open at a
time.
Google had
its own
DNS that
translates a
server’s
name
(URL) into
an address
in order to
keep delays
to a
minimum
When the
Google
spider
looked at an
HTML page
looks words
within page
occurring in
the
title,subtitle
s,meta tags
etc.

18. 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