SEARCH ENGINE

1

Overview

Introduction

Motivation

Types of Search Engine

History of Search Engine

Architecture of Search Engine

Advantages of Search Engine

Disadvantages of Search Engine

References

2

Introduction

Search:

Examine a computer file, disk, database, or network for particular information.

Engine:

Something that supplies the driving force or engery to a movement, system.

Search engine:

Search engines are computer programs that searches for particular keywords and returns

a list of the documents where the keywords were found.

A search engine is a search service which automatically indexes web pages.

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Motivation

Today we lives in the world, where the word “Internet ” itself means that “To make life easy”.

Nowadays, internet play very important role in each and every field like Education, Business,

Health, Transportation etc.

Today, here many of the people connected with internet and when we are talking about “Internet”

the search engine is like heart of internet.

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Types of Search Engine

Crawler-Based Search Engine:

Crawler-based search engines use automated software programs to categories web pages.

Programs used by the search engines to access our web pages is called ‘spider’, ‘crawlers’,

‘robots’, ‘bots’.

A spider will find a web page, download it and analyses the information presented on the

web page, then add it to the search engine’s database.

This type of search engines continuously on web to search new web pages and updating

their database with new or altered pages.

E.g. : Google, Alltheweb and altavista[1]

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Conti….

Human-powered directories :

Depend on human editors to create their listings.

Human-powered directories are good when we are interested in a general topic of search.

Therefore, search results found in a human-powered directory are usually more relevant to

the search topic and more accurate.

However, this is not an efficient way to find information when a specific search topic is in

mind.

E.g. :Yahoo directory , open directory and looksmart[1]

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Conti….

Meta Search Engine :

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.

E.g. :

Dogpile – https://www.dogpile.com

SavvySearch – http://www.search.com

MetaCrawler – http://www.metacrawler.com[1]

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History of Search Engine

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Table 1: History of search engine

Year Name

1990 Archie

1991 Veronica & jughead

1992 VLib

1993

Excite

World Wide Web Wanderder

ALIWEB

Conti….

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Table 1: History of search engine

Year Name

1994

Infoseek

WebCrawler

Yahoo!Search

1995 LookSmart

1996 Google

HotBot

1997 Ask

1998 MSN

dmoz

Conti….

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Table 1: History of search engine

Year Name

1999 Alltheweb

2005 Snap

2006 Microsoft Livesearch

2008 Cuil

2009 Microsoft Bing

Conti….

Archie :

First tool used for searching on the

internet was archie in 1990 by alan

emtage a student at mcgill university in

montreal.

The original intent of the name was

"archives" but it was shortened to archie.

Due to the limited space ,only the listing

were available and can not store the

content of site[2].

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Conti….

VLib :

A virtual library is a collection of

resources available on one or more

computer systems, where a entry point

to the collections is provided.

The entire content of a library made

accessible via the internet. The content

may come from different providers (e.g.,

The “German virtual libraries”)[3].

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Conti….

Veronica & jughead :

Search file names and titles stores in

gopher index system.

Veronica served the same purpose as

archie, but it worked on plain text files.

Another user interface name jughead

appeared with the same purpose as

veronica, both of these were used for

files sent via gopher, which was created

by mark the university of minnesota in

1991[2].

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Conti….

Yahoo!Search :

In april 1994 yahoo! Directory created by

david filo and jerry yang.

In beginning it collect the their favorite

web pages[2].

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Architecture of Search Engine

Architecture consists of components, the interfaces provided by those components, and the

relationships between them.

Architecture of a search engine determined by two requirements:

1. Effectiveness (quality of results)

2. Efficiency(speed: response time)

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Indexing Process

Fig:1 Indexing Process

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Query Process

Fig:2 Query Process

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Advantages of Search Engine

Easy to acquire different information from different topics.

Determine specifically information.

We can expand our knowledge easily through using search engine. [4]

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Disadvantages of Search Engine

List of retrieved documents contains a high percentage of irrelevant documents.

Some spiders retrieve only the document's title others retrieve entire document text. Unless you

understand how spider works you are not very likely to succeed. .[4]

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References

1. Http://www.Yuanlei.Com/studies/articles/is567-searchengine

2. Http://www.Wordstream.Com/articles/internet-search-engines-history

3. Http://www.Igi-global.Com/dictionary/virtual-library

4. http://www.slideshare.net/search/slideshow

5. https://www.google.co.in

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THANK YOU!!!