Basic of Websites

WHAT IS SEARCH ENGINE ?
 
INTRODUCTION OF SEARCH ENGINE...
 
A WEB SEARCH ENGINE IS A SOFTWARE SYSTEM THAT IS DESIGNED TO SEARCH FOR INFORMATION ON THE WORLD WIDE WEB . THE SEARCH RESULTS ARE GENERALLY PRESENTED IN A LINE OF RESULTS OFTEN REFERRED TO AS SEARCH ENGINE RESULTS PAGES(SERPs).THE INFORMATION MAY BE A MIX OF WEB PAGES,IMAGES ,AND OTHER TYPES OF FILES .SOME SEARCH ENGINES ALSO MINE DATA AVAILABLE IN DATABASES OR OPEN DIRECTORIES.UNLIKE WEB DIRECTORIES ,WHICH ARE MAINTAINED ONLY BY HUMAN EDITORS,SEARCH ENGINES ALSO MAINTAIN REAL-TIME INFORMATION BY RUNNING AN ALGORITHM ON A WEB CRAWLER.


COMPONENTS OF SEARCH ENGINE

1. WEB CRAWLER : IT IS KNOW AS SPIDER OR BOTS.IT IS SOFTWARE THAT TRAVELS THE WEB TOGETHER INFORMATION.
2. DATABASE:WE ALL KNOW ABOUT THE DATABASES. THIS HELPS TO STORED THE INFORMATION OF ALL WEBSITES WHERE BOTS TRAVEL.
3. SEARCH INTERFACE:IT IS COMPONENTS IN AN INTERFACE BETWEEN USER AND DATABASE IT HELPS TO SEARCH THROUGH THE DATABASE FOR USER.

EXAMPLES  OF SEARCH ENGINES:-

• GOOGLE:- IT WAS ORIGINALLY CALLED  BANKRUB.IT IS THE MOST POPULAR SEARCH ENGINE GLOBALLY. 

• BING : IT WAS LAUNCHED IN 2001 BY THE MICROSOFT.IT IS THE LATEST WEB BASED SEARCH ENGINE THAT ALSO DELIVER ALSO YAHOO ANSWER.

• ASK :- IT WAS LAUNCHED 1996 AND ORIGINALLY KNOWN AS ASK JEEVES.IT INCLUDES SUPPORTS FOR MATCH,DICTIONARY AND CONVERSION QUESTION. 

• LYCOS:- IT IS THE TOP 5 INTERNET PORTAL LARGEST ONLINE PROPERTY ACCORDING TO MEDIA MATRIX. 

• ALTAVISTA:- SINCE 1995,IT WAS LAUNCHED BY (DIGITAL EQUIPMENTCO-OPERATION) IT IS POWERED BY YAHOO TECHNOLOGY.