engleski

Search engines, metasearch engines and subject directories

On WWW we can retrieve documents, view images and animation, listen to sound files... Programming language called HTML is in every Web document. Also, every Web document has a unique URL (uniform resource locator). Actually, it is the address of the web page. For access on the Internet we use a computer program called browser. Currently, the most popular browsers are Netscape and Internet Explorer. Besides these mentioned, there are some other browsers, e. g. Opera and Macweb. To searc for some documents on the Web we use search engines. A search engine is a web search facility that can help the user to locate desired information faster and more comprehensively. It has usually two parts: a 'robot' or 'crawler' that goes to every page or representative page on the Web and creates a huge index, and a program that receives the user search request, compares the user request to the entries in the index and returns the results to the user. The poster provides a list of a several search and metasearch engines, and also Subject Directories. . Some of search engines are: § Google: http://www.google.com ; a huge search engine, claims over 3 billion pages, and the subject directory is included. § AllTheWeb Advanced: http:// www.alltheweb.com/ ; a general web database, has over 2 billion pages, excellent ranking, its Advanced Search allows to formulate very complex search strategies § AltaVista: http://www.altavista.com ; means "a view from above", a general web database, with full Bollean logic available in Advanced Search, § HotBot: http://hotbot.lycos.com ; gives you a choice between Google, FAST, Inktomi and Teoma, but you can’ t meta search all at the same time Metasearch engines are the the search engines of search engines, meaning that they make informational queries to many engines simultaneously. They give results from all the search engines queried. Metasearch engines do not own a database of Web pages, they send search terms to the databases by search engine companies. § Dogpile: http://www.dogpile.com ; you get to search for more than 20 search engines at once. Also, in Advanced search you can select which engines to use in your search. § MetaCrawler: http://www.metacrawler.com ; searches top search engines as About, Ask Jeeves, FAST, LookSmart… .In advanced search you can select which engines to use, view results sorted out by relevance or sources. Subject directories are hand-picked web pages and are usually classified by subject. One of them is: § Librarian’ s Index to the Internet: http://www.lii.org ; a searchable subject directory of more than 11000 Internet resources selected and evaluated by librarians

Search engines; Metasearch engines

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