SlideShare a Scribd company logo
MADE BY:
SAHIBA KHURANA
BMS

ACKNOWLEDGEMENT
I WOULD LIKE TO EXPRESS MY
GRATITUDE TO MS. SURBHI GUPTA
, FOR PROVIDING ME WITH THE
GUIDANCE AND KNOWLEDGE TO
COMPLETE THIS PROJECT.

CONTENTS
 WHAT ARE SEARCH ENGINES?
 IMPORTANCE OF SEARCH ENGINES
 TYPES OF SEARCH ENGINES:
 CRAWLER BASED
 DIRECTORIES
 HYBRID
 META
 HOW TO USE SEARCH ENGINES EFFECTIVELY

WHAT ARE SEARCH
ENGINES?
 A web search engine is a software system that is
designed to search for information on the World
Wide Web.
 It uses the keywords to search for documents that
relate to these key words and then puts the result in
order of relevance to the topic that was searched for.

SOME EXAMPLES OF
SEARCH ENGINES

 Search engines 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 engines 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
IMPORTANCE

TYPES OF SEARCH
ENGINES
CRAWLER BASED
DIRECTORIES
HYBRID SEARCH ENGINES
META SEARCH ENGINES

CRAWLER BASED SEARCH
ENGINES
 These types of search engines use a "spider" or a
"crawler" to search the Internet. The crawler digs
through individual web pages, pulls out keywords
and then adds the pages to the search engine's
database. Google and Yahoo are examples of
crawler search engines.
 Crawler-based search engines are good when you
have a specific search topic.

GOOGLE
Google was founded by Larry Page and Sergey Brin.
The homepage of Google has a button labeled as “I’m
feeling lucky ”. When a user types in a search and clicks on
the button , the user is directly taken to the first search
result.
Google has various “special features” which include
weather, unit conversion, currency conversion, time
, calculator, maps etc.

Advanced Search

Yahoo!
Yahoo was founded by David Filo and Jerry
Yang
Yahoo operates a portal that provides the latest
news, entertainment, and sports information.
The portal also gives users access to other Yahoo
services like Yahoo Mail, Yahoo Maps, Yahoo
Finance, Yahoo Groups and Yahoo Messenger.

DIRECTORIES
 Directories depend on human editors to create their
listings or the database. Yahoo Directory, Open
Directory and Look Smart are few examples.
 Human-powered directories are good when you are
interested in a general topic of search


HYBRID SEARCH
ENGINES
 Hybrid search engines are search engines that use
both crawler based searches and directory searches
to obtain their results .
 Example:- Yahoo.com- Google.com

META SEARCH
ENGINES
 These transmit user-supplied keywords
simultaneously to several individual search engines
to actually carry out the search.
 Search results returned from all the search engines
can be integrated, duplicates can be eliminated and
additional features such as clustering by subjects
within the search results can be implemented by
meta-search engines.
 Example: Dogpile, Metacrawler


HOW TO USE SEARCH
ENIGNES?
•A “+” before a word in a search will locate for
documents which definitely contain the word.+
•A “-” before a word will exclude that word from
search.
-
•Placing words between quotation marks will
search for phrase between the quotes.“ ”
•Using “or” between search phrase will search
each term separately.or

Example:
 +BLACK+BLUE: The search results will contain
documents which contain the word black and the word
blue.
 BLACK-BLUE: Those documents will be returned which
contain the word black but not the word blue.
 “BLACK BLUE”: Those documents will be returned
which include the phrase black blue. (placed together).
 BLACK OR BLUE: Those documents will be returned
which contain the term black or the term blue.

THANK YOU

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Search engines

  • 2.  ACKNOWLEDGEMENT I WOULD LIKE TO EXPRESS MY GRATITUDE TO MS. SURBHI GUPTA , FOR PROVIDING ME WITH THE GUIDANCE AND KNOWLEDGE TO COMPLETE THIS PROJECT.
  • 3.  CONTENTS  WHAT ARE SEARCH ENGINES?  IMPORTANCE OF SEARCH ENGINES  TYPES OF SEARCH ENGINES:  CRAWLER BASED  DIRECTORIES  HYBRID  META  HOW TO USE SEARCH ENGINES EFFECTIVELY
  • 4.  WHAT ARE SEARCH ENGINES?  A web search engine is a software system that is designed to search for information on the World Wide Web.  It uses the keywords to search for documents that relate to these key words and then puts the result in order of relevance to the topic that was searched for.
  • 6.   Search engines 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 engines 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 IMPORTANCE
  • 7.  TYPES OF SEARCH ENGINES CRAWLER BASED DIRECTORIES HYBRID SEARCH ENGINES META SEARCH ENGINES
  • 8.  CRAWLER BASED SEARCH ENGINES  These types of search engines use a "spider" or a "crawler" to search the Internet. The crawler digs through individual web pages, pulls out keywords and then adds the pages to the search engine's database. Google and Yahoo are examples of crawler search engines.  Crawler-based search engines are good when you have a specific search topic.
  • 9.  GOOGLE Google was founded by Larry Page and Sergey Brin. The homepage of Google has a button labeled as “I’m feeling lucky ”. When a user types in a search and clicks on the button , the user is directly taken to the first search result. Google has various “special features” which include weather, unit conversion, currency conversion, time , calculator, maps etc.
  • 11.  Yahoo! Yahoo was founded by David Filo and Jerry Yang Yahoo operates a portal that provides the latest news, entertainment, and sports information. The portal also gives users access to other Yahoo services like Yahoo Mail, Yahoo Maps, Yahoo Finance, Yahoo Groups and Yahoo Messenger.
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  • 13.  DIRECTORIES  Directories depend on human editors to create their listings or the database. Yahoo Directory, Open Directory and Look Smart are few examples.  Human-powered directories are good when you are interested in a general topic of search
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  • 15.  HYBRID SEARCH ENGINES  Hybrid search engines are search engines that use both crawler based searches and directory searches to obtain their results .  Example:- Yahoo.com- Google.com
  • 16.  META SEARCH ENGINES  These transmit user-supplied keywords simultaneously to several individual search engines to actually carry out the search.  Search results returned from all the search engines can be integrated, duplicates can be eliminated and additional features such as clustering by subjects within the search results can be implemented by meta-search engines.  Example: Dogpile, Metacrawler
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  • 18.  HOW TO USE SEARCH ENIGNES? •A “+” before a word in a search will locate for documents which definitely contain the word.+ •A “-” before a word will exclude that word from search. - •Placing words between quotation marks will search for phrase between the quotes.“ ” •Using “or” between search phrase will search each term separately.or
  • 19.  Example:  +BLACK+BLUE: The search results will contain documents which contain the word black and the word blue.  BLACK-BLUE: Those documents will be returned which contain the word black but not the word blue.  “BLACK BLUE”: Those documents will be returned which include the phrase black blue. (placed together).  BLACK OR BLUE: Those documents will be returned which contain the term black or the term blue.