Presentationon Search Engines

Presenters: SwatiRichaSheetal

OutlineWhat are Search EnginesTechnical terms associated with

SEBasic Web Search EngineTypes of Search EnginesWorking of Search EnginesDirectoriesCrawler based Search EnginesSEO

…..cont’dKeyword Search OperatorsVarious search EnginesComparisonSearching Technique10 Do’s and Don’ts while

Searching

What are Search Engines?A search engine is a sophisticated piece

of software, accessed through a page on a website that allows you to search the web by entering search queries into a search box.

The search engine allows one to ask for content meeting specific criteria and retrieving a list of references that match those criteria.

Search engines use regularly updated indexes to operate quickly and efficiently.

Technical terms associated with SECrawling – Follow links to find informationIndexing

– Record what words appear whereRanking

– What information is a good match to a user query?

Displaying– Find a good format for the information

Serving– Handle queries, find pages, display results

A. Frank-T.Sharon 6

Basic Web Search Engine

database

RetrievalGathering

WWW

Administrator Users

Search Engine

Search Engine

Types of Search EnginesBasic Search Engines

◦assembled by software -- automated "spiders" or softbots.

Directory/Guide◦Hierarchical list of subject categories --

assembled by people (“humanly-compiled”).Meta-Search Engines

◦Uses several basic search engines in parallel.Special(ty) Search Engines/Tools

◦Dedicated to a focused domain/community/media.

Popularity Search Engines◦Use popularity link/usage analysis.

Working of Search EnginesDirectoriesCrawler-based search engines

DirectoriesUnlike search engines, which use

special software to locate and index sites, directories are compiled and maintained by humans.

Directories often consist of a categorised list of links to other sites to which you can add your own site.

Crawler based Search EnginesCrawler-based search engines use

sophisticated pieces of software called spiders or robots to search and index web pages

These spiders are constantly at work, crawling around the web, locating pages, and taking snapshots of those pages to be cached or stored on the search engine’s servers

They are so sophisticated that they can follow links from one page to another and from one site to another

Crawlers based Search EnginesGoogle is a prominent example of a crawler-

based search engine.Yahoo features both directories and crawler-

based search engines.Metadata

Metadata

Metadata

Metadata

Metadata

Metadata

Crawlers collecting data

SEO……Technical part of web marketing.

Keyword Search OperatorsPlus (+) Operator Minus (-) operator Related (~) operator OR operator

Plus (+) Operator

Figure (a)

Figure (b)

Minus (-) operator

Related (~) operator

OR operator

Various Search Engines

ComparisonALTAVISTA

GOOGLE MSN YAHOO!

WWW YES YES YES YES

IMAGE SEARCH

YES YES YES YES

PROXIMITY

NO YES(using *)

NO NO

TRUNCATION

NO NO YES YES

THUMBNAILS

NO NO NO NO

LANGUAGE

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Searching TechniquesProximity Searching

Ability to specify how close within a record multiple terms should be to each other

Phrase Searching Requires terms to be in the exact

order specified within the phrase markings. The default standard for identifying phrases is to use double quotes (" ") to surround the phrase.

10 Do’s and Don’ts while Searching

Do’s Use apt keywords. Use ‘+’ sign while searching for

multiplekeywords.

Use quotes to search for exact phrases on the net.

Use specific portals for better results.

Practice cross-referencing.

Don’t’s

Don’t rely much on sponsored links.

Avoid using form words. Check for authenticity of source. Don’t stop at the first page of

results . Don’t use just one search engine.

How to add Search Engine on your browsers

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Customized Search Engines Why can’t we just use a

normal search engine?

Specific Subject/project Focus your learners Protect younger learners against possible “bad sites” Act as a knowledge filter Make good sites more accessible Eliminate possible millions of

irrelevant results Guide learners towards educator-

evaluated web sources

Create your own search engineOpen your browser and

type in (or click):http://tr.im/googlesearch Sign into Google using

your username and password or Register for an account

If you already have a Gmail Account you can sign into any Google application with your username and password

To use all the lovely Google stuff you need an

account!

Create your own search engine

Decide on a name for your search engine.

Provide a brief description of exactly where your search engine will be searching

Restrict the sites to those you choose

By choosing a good search engine name, it will make it easy for other teachers to find it easily and re-use it as well!

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Type in the sites that you want to include (1 per line)

Select Edition

Agree

Next

You will be able to edit this list and add more sites later.

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You will now be able to share the link to your search engine or you can even embed it on your school/class website or blog

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How do I find my search

engine again?

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Future Image Scanning Search Engines.Don’t Chat or E-Mail, Wave

Instead.Voice Recognition & Emotion

Understanding.Better Resources to Search

Through.Visual Searching

ANY QUERIES ?????

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