This document provides an overview of search engines. It defines search engines as web tools that use automated software programs called spiders to crawl the web, following links and indexing pages to create a searchable database. The document discusses the history of search engines, including some of the earliest tools, and explains the importance of search engines for filtering the vast amount of online information. It describes different types of search engines such as crawler-based, directory-based, hybrid, and meta search engines. Finally, it provides tips for effective searching and concludes that the usefulness of a search engine depends on the relevance of the results it provides.

1. www.oeclib.in
Submitted By:
Odisha Electronics Control Library
Seminar
On
Search Engines

2. CONTENT
 Definition of Search Engines
 History of Search Engines
 Importance of Search Engines
 Types of Search Engines
 Crawler based search engines
 Search directories or indexes
 Hybrid search engines
 Meta search engines
 How to use Search Engines?
 Conclusion
 References

3. SEARCH ENGINE
 A search engine is a web-based tool that enables
users to locate information on the World Wide Web.
Popular examples of search engines are Google,
Yahoo!, and MSN Search.
 Search engines utilize automated software
applications (referred to as robots, bots, or spiders)
that travel along the Web, following links from page to
page, site to site.
 The information gathered by the spiders is used to
create a searchable index of the Web.

4. SOME EXAMPLE OF SEARCH ENGINE

5. HISTORY OF SEARCH ENGINES
 The first tools used for searching in the internet was
Archie in 1990 by Alan Emtage.
 In 1991, two new search programs Verconica and
Jughead.
 In septermer 1993, W3Catalog was the first web
primitive search engines.

6. IMPORTANCE 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

7. TYPES OF SEARCH ENGINES:
• There are three main types of search engine
tools:
• Crawler based search engines
• Search directories or indexes
• 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.

10. 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.

12. 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

14. 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

15. META SEARCH ENGINE
• A meta search engine is a tool that helps to locate
information available via the WWW.
• It provide a single interface that enables users to
search many different search engines, indexes and
databases.
• Thus Meta search engines are capable of searching
several search engine databases at once.
Eg:
• Dogpile - http://www.dogpile.com
• SavvySearch - http://www.search.com
• MetaCrawler -http://www.metacrawler.com

16. ADVANTAGES OF USING SEARCH ENGINE
 Easy to acquire different information from different
topics
 determine specifically information
 Sorting and adding value to the information

17. DISADVANTAGES OF USING SEARCH ENGINE
 Too many websites visitors
 Too many websites leads/sales

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. EXAMPLES
 +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.

20. CONCLUSION
 The usefulness of a search engine depends on the
relevance of the results it gives back.
 While there may be millions of Web pages that
include a particular word or phrase, some pages
may be more relevant, popular, or authoritative than
others.

21. REFERENCE
 www.google.com
 www.wikipedia.com
 www.oeclib.in

22. Thanks