Search Engine
6 likes4,617 views
This document discusses different types of search engines. It describes web-based search engines which search the internet, and system-based search engines which search files on a user's computer. The main types of web-based search engines discussed are crawler-based engines like Google which use bots to index webpages, directory-based engines like Yahoo which use human editors to categorize sites, and hybrid engines that combine both approaches. Other types discussed include meta search engines, paid inclusion, and specialty search engines for specific topics.
Search Engine
- 1. Search Engine Ankush Srivastava Search Engine MCA VI Semester Dept. of Computer Science University of Lucknow Lucknow.
- 2. Searching What is searching and what we search? Search Engine Somewhere in a collection of documents, Web pages, and other sources, there is information that we want to find, but we have no idea where it is. The searching process give us the means of finding that information.
- 3. Types of Search Engines Search Engine Web-Based Search Engines System-Based Search Engines
- 4. System Based Searching Search Engine Its complete indexing of all the files in the computer like documents, texts, music, pictures etc. The program allows text searches of a user's needed files. For Example Google Desktop.
- 5. Web Based Searching A web based searching is designed to search information on the internet or World Wide Web. Search Engine For Example Google, Yahoo etc.
- 6. Types of Search Engine • Crawler-Based Search Engine • Directories • Hybrid Search Engines • Meta Search Engines • Paid Inclusion • Specialty Search Engines
- 7. Crawler-Based Crawler-based search engines use automated software programs to survey and categories web pages. The programs used by the search engines to access your web pages are called ‘spiders’, ‘crawlers’, ‘robots’ or ‘bots’. A spider will find a web page, download it and analyses the Search Engine information presented on the web page. This is a seamless process. The web page will then be added to the search engine’s database. Crawler-based search engines are constantly searching the Internet for new web pages and updating their database of information with these new or altered pages. Eg:- Google
- 8. Directories A ‘directory’ uses human editors who decide what category the site belongs to; they place websites within specific categories in the ‘directories’ database. The human editors comprehensively check the website and rank it, based on the information they find, using a pre- defined set of rules. Search Engine For eg: Yahoo Directory (www.yahoo.com ) Open Directory (www.dmoz.org )
- 9. Hybrid Search Engines Hybrid search engines use a combination of both crawler-based results and directory results. More and more search engines these Search Engine days are moving to a hybrid-based model. Examples of hybrid search engines are: Yahoo (www.yahoo.com ) Google (www.google.com )
- 10. Meta Search Engines Meta search engines take the results from all the other search engines results, and combine them into one large listing. Examples of Meta search engines include: Search Engine Metacrawler (www.metacrawler.com ) Dogpile (www.dogpile.com )
- 11. Paid Inclusion Most directories offer some form of paid inclusion. Paid inclusion Search Engine guarantees your website gets reviewed and/or indexed promptly.
- 12. Specialty Search Engines Specialty search engines have been developed to cater for the demands of niche areas. There are many specialty search engines, including: Search Engine Shopping - Froogle (www.froogle.com ) - Yahoo Shopping (www.shopping.yahoo.com ) Local Search - NZPages (www.nzpages.co.nz ) - SearchNZ (www.searchnz.co.nz )
- 13. Domain Name Search - iServe (www.iserve.co.nz ) - Freeparking (www.freeparking.co.nz ) Search Engine Freeware & Shareware Software Search - Tucows (www.tucows.com ) - CNET Download.com (www.download.com )
- 14. List of top Search Engines 1.- Google 2.- Yahoo Search Engine 3.- Bing 4.- Ask 5.- Aol 6.- AltaVista 7.- Fast 8.- Gigablast 9.- Netscape search 10.- Snap.com 11.- Search.com