الرحيم الرحمن الله بسم

SEARCHING & EVALUATING

THE WEB PAGES

The Internet is a vast inter-connected computer network around the world that allows the sending and travel of information through cables ,and satellites.

The Internet includes commercial, educational, governmental, and other networks, all of which use the same set of communications protocols.

The World Wide Web isa system of extensively interlinked hypertext

documents: a branch of the Internet.

• The WORLD Wide Web is a blessing ,we should be thanking to God for it .

• I t is one of this age miracles , not only scientific, but also social ,cultural ,economical ,and religious .

Before the Internet

Scattered information sources ,gained through a lot of time ,effort ,and money

poor communication between people around the world

Library services were limited with fixed times.

To meet life needs we had to travel a lot

Information was not updated continuously

On the other hand ,the Internet does not contain everything ,it only has 5% of the world literature

So We need to use other information sources as well.

Searching the web

searching the web

visible web

subject search

tools(directories)

search enginesSin

gle search engines

Meta

search engines

invisible web(deep Web)

databases others

subject search tools(directories)

http://dir.yahoo.com/

http://www.dmoz.org/

http://www.ukplus.co.uk/

http://www.ask.com/

To get an overview of a topic , significant sites on a topic, discover the other relative subjects

Single Search engines

www.google.com

www.altavista.com

http://www.hotbot.com/

www.icerocket.com

When looking for topics described by very specific terms

Meta search engines

To get a survey of what has been mentioned on different sites about a topic

www.mamma.com www.dogpile.comwww.kartoo.comwww.infogrid.com

Databases

Databases

www.eulc.edu.eg

www.libraryresearch.com

http://www.csa.com/factsheets/lisa-set-c.php

Other invisible web tools

www.hakia.com

http://www.ipl.org/

http://infomine.ucr.edu/