2. 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 is a system of extensively interlinked hypertext documents: a branch of the Internet.

4. 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.

6. 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

7. 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.

8. Searching the web searching the web visible web subject search tools(directories) search engines Single search engines Meta search engines invisible web(deep Web) databasesothers

9. 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

10. 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

11. Meta search engines To get a survey of what has been mentioned on different sites about a topic www.mamma.com www.dogpile.com www.kartoo.com www.infogrid.com

12. Databases

13. www.eulc.edu.eg www.libraryresearch.com http://www.csa.com/factsheets/lisa-set-c.php

14. Other invisible web tools www.hakia.com http://www.ipl.org/ http://infomine.ucr.edu/