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.
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 Veronica and Jughead.
In September 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
services like Yahoo Mail, Yahoo Maps, Yahoo
Finance, Yahoo Groups and Yahoo Messenger.
11.
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
13.
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
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.
