This document discusses search engines and how they work. It defines search engines as programs that use keywords to search websites and return relevant results. It describes the main types of search engines: crawler-based like Google and Yahoo, directories like Yahoo Directory, hybrids that use both crawling and directories, and meta search engines that search multiple engines at once. Examples are provided for each type. The document also provides tips for effective searching, like being specific, using symbols like + and -, and quotation marks.

1. Made by : ADARSHMISHRAMade by : ADARSHMISHRA
FirstSem. , C.S.E.

2. I have preferred internet for the completion of this presentation.I have preferred internet for the completion of this presentation.
I have collected some meaningful information which was
essential for this presentation.

3. CONTENTS
 What are Search Engines?
 Importance of Search Engines
 Types of Search Engines
*Crawler based*Crawler based
*Directories
*Hybrid
*Meta
* How to use Search Engines

4. What are search engines?
 It is basically a type of program that uses keywords to
search for documents that relate to these keywords
and then puts the results found in the order ofand then puts the results found in the order of
relevance to the topic that was searched for.
 A web search engine is a software system that is
designed to search for information on the World wide
Web

5. SOME EXAMPLES

6. IMPORTANCE
 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.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 transforms it
into results that each individual can easily access and
used with in the matter of seconds.

7. TYPES OF SEARCH ENGINES
• Crawler Based
• Directories• Directories
• Hybrid Search Engines
• Meta Search Engines

8. CRAWLER BASED SEARCH ENGINES
 These type of search engines use a “spider” or a
“crawler” to search the internet. The crawler digs
through individual web pages, pulls out keywords andthrough individual web pages, pulls out keywords and
then adds the pages to the search engine’s database.
Google and Yahoo are the example of crawler search
engines.
 Crawler-based search engines are good when you have
specific search topic.

9. GOOGLE
*Google began in January 1996 and founded by Larry Page and Sergey
Brin.
*Google’s homepage includes a button labeled “I’m Feeling Lucky”.
When a user type in a search and clicks on the button the user will be
taken directly to the first search result.
*Google has more than 22 “special features” like : weather, unit

10. YAHOO!
Yahoo was founded by JERRY YANG
and DAVID FILO.
• Yahoo! Provides Internet• Yahoo! Provides Internet
communication services such as Yahoo!
Messenger and Yahoo! Mail.
•Yahoo! Provides social networking
services such as My Web, Yahoo!
Personals.

11. ADVANCED SEARCH

13. DIRECTORIES
 Directories depend on human editiors to create their
listings or the database. Yahoo Directory, Open
Directory and Look Smart are few examples.Directory and Look Smart are few examples.
 Human-powered directories are good when you are
interested in a general topic of search.

14. EXAMPLE OF DIRECTORY

15. HYBRID SEARCH ENGINES
 Hybrid search engines are search engines that use
both crawler based searches and directory searches to
obtain their results.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.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 with
in the search results can be implemented by meta-
search engines.
 Example: Dogpile , Metacrawler

17. EXAMPLE OF META SEARCH ENGINES

18. How to use search engines
 1) Be specific: when searching on a search engines be more specific in
wording.
 2) Use the + symbol and – symbol: If you want to use the + symbol
before each word so that only web pages that have both words appear.before each word so that only web pages that have both words appear.
Example: +fruits +vegetables. On the other hand you can use the -
symbol if you are looking for a topic such as Shakespeare and just want
to search for his sonnets you can search for it as –Shakespeare-
sonnets.the exact result will appear.
 3) Use Quotation marks : The marks are used if you want to search for
specific phrases. Example: “Marks Krikorian biography”
 Combining symbols : you can combine all the symbols explained above
to do the search your own way.