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UNDERSTANDINGWWW - SEARCH ENGINE[Replica].pdf
- 1. UNDERSTANDING WWW - SEARCH ENGINE • SEARCH ENGINE R.priyadharshini biological science
- 2. WWW-SEARCH ENGINE • INTRODUCTION: ❖ Search engine came intro existence in 1994. According to YAHOO Search engine directory-2003, there are over 448 major search engine. ❖ A SE is a searchable database of internet files collected by a computer program (called wanderer, crawler, rebot, worm and spider).
- 3. WHAT IS SEARCH ENGINE ❖A Search engine is a coordinated set of programs that searches for and identifies items in a database that match specified criteria. Search engines are used to access information on the world wide web.
- 4. HISTORY OF SEARCH ENGINES ❖ ARCHIE was the first well developed search engine in the year 1990. It used to search files by matching their names and indexing on FTP server. ❖ In 1992 VERONICA search engine was developed for GOPHER based website. ❖ Later in 1993 W3CATALOG and ALIWEB were formed which were web search engines WEBCRAWLER search engine was the first to allow users search keywords.
- 5. ❖ Finally in 1994, the search engine YAHOO wash developed which gained immense popularity. Earlier it was just a directory but in 1995 search feature was also added. ❖ In 1998 when GOOGLE was founded as till now is the most used and preferred browser all across the globe . However, there have been other frequently used search engines formed after google like BAIDU, BING, YANDEX, etc.
- 6. IMPORTANCE OF SEARCH ENGINES • Search engines are important because with over 8 billion web pages available, it would be impossible to search for the information that is specifically needed. • This is why search engines are used to filter the information that is on the internet and transform it into results that each individual can easily access and use within the matter of seconds.
- 7. TYPES OF SEARCH ENGINES • There are three main types of search engine tools: • Crawler based search engines • Search directories or indexes • Hybrid search engines • Meta search engines
- 8. CARWLER BASED SEARCH ENGINES • These types of search engines use a SPIDER or a CRAWLER to the searche the internet . • The crawler digs through individual web pages, pulls out keywords and then adds the pages to the searches engines database. GOOGLE and YAHOO are example of crawler search engines.
- 9. GOOGLE • GOOGLE was founded by LARRY PAGE and SERGEY BRIN. • GOOGLE has various special features which include weather, unit conversion, currency conversion, time, calculator, maps, etc.
- 10. YAHOO • YAHOO was found by DAVID FILO and JERRY YANG. • YAHOO operates a portal that provides the latest news, entertainment and sports information. The portal also gives users access to other yahoo services like yahoo mail, yahoo maps, yahoo finance, yahoo groups and yahoo messenger.
- 11. DIRECTORIES • Directories depend on human editors to create their listings or the datsabase. YAHOO directory, OPEN directory and LOOK smart are few example. • Human- powered directories are good when you are interested in general topic of search.
- 12. HYBRID SEARCH ENGINES : Hybrid search engines are search engines that use both crawler based searches and directory searches to obtain their result. Example – yahoo.com google.com
- 13. META SEARCH ENGINE • A meta search engine is a tool that helps to locate information available via the WWW. • It provide a single interface that enable users to search many different search engines, indexes and database. • Thus meta search engines are capable of searching several search engine databases at once. • Eg.. • Dogpile-http://www.dogpile.com • Metacrawler-http://www.metacrawler.com
- 14. SEARCH ENGINE ARCHITECTURE • The search engine architecture comprises of the three basic layers listed below: • Content collection and refinement. • Search core. • User and application interfaces.
- 15. HOW TO USE SEARCH ENGINE • + - A + before a word in a search will locate for documents which definitely contain the world. • - - A- before a word will exclude that word from search. • “ “ – placing words between quotation marks will search for pharse between the quotes. • or – Using or between search pharse will search each term separately
- 17. ADVANTAGES OF USING SEARCHENGINE • Easy to acquire different information from different topics. • Determine specifically information. • Sorting and adding value to the information. •Facilitates continuous learning by providing access to diverse knowledge sources.
- 18. DISADVANTAGES OF USING SEARCH ENGINE • Too many websites visitors. • Too many websites leads / sales. •Search engines may display copyrighted content without proper authorization, leading to legal concerns. •Storing massive amounts of user data poses security risks, as evidenced by potential data breaches.
- 19. CONCLUSION • search engines play a pivotal role in navigating the vast expanse of information on the internet, serving as indispensable tools for users worldwide. Their complex algorithms and continuous evolution reflect the dynamic nature of the digital landscape. As technology advances, the future holds exciting possibilities for search engines, promising enhanced efficiency, personalization, and a more seamless integration into our daily lives. Ultimately, these digital gateways empower users to access knowledge, connect with diverse content, and stay informed in an ever-expanding online universe.
- 20. REFERENCE • Bing: www.bing.com • Yahoo: www.yahoo.com • DuckDuckGo: www.duckduckgo.com • Ask.com: www.ask.com • Yandex: www.yandex.com • AOL Search: search.aol.com • Slide share: www.side share.net