SayPro 116931-2-4 SayPro Lesson Search engines

Search engines are programmes that search documents for specified keywords and returns a list of the documents where the keywords were found. A search engine is really a general class of programmes; however, the term is often used to specifically describe systems

Typically, Web search engines work by sending out a spider to fetch as many documents as possible. Another programme, called an indexer, then reads these documents and creates an index based on the words contained in each document. Each search engine uses a proprietary algorithm to create its indices such that, ideally, only meaningful results are returned for each query.

How is document relevancy determined?

Once a search engine has found documents in its database that relate to your input, it will list them according to their relevance. The questions is now, how is this relevancy determined? The algorithm, a list of procedures and factors, is different from company to company. Sometimes they are described on the search engines pages, but mostly they are kept behind the curtain.

TYPES OF SEARCH ENGINES

Type	Search Engine	Description
All-Purpose Search Engines		Google – The world’s most popular search engine.
		Bing Search: Microsoft’s entry into the burgeoning search engine market. Better late than never.
		Yahoo! Search: The 2nd largest search engine on the web (as defined by a September 2007 Nielsen Netratings report.
		AltaVista: Launched in 1995, built by researchers at Digital Equipment Corporation’s Western Research Laboratory. From 1996 powered Yahoo! Search, since 2003 – Yahoo technology powers AltaVista.
		Cuil: Cuil was a search engine website (pronounced as Cool) developed by a team of ex-Googlers and others from Altavista and IBM. Cuil, termed as the ‘Google Killer’ was launched in July, 2008 and claimed to be world’s largest search engine, indexing three times as many pages as Google and ten times that of MS. Now defunct.
		Excite: Now an Internet portal, was once one of the most recognized brands on the Internet. One of the famous 90’s dotcoms.
		Go.com: The Walt Disney Group’s search engine is now also an entire portal. Family-friendly!
		HotBot was one of the early Internet search engines (since 1996) launched by Wired Magazine. Now, just a front end for Ask.com and MSN.
		AllTheWeb: Search tool owned by Yahoo and using its database, but presenting results differently.
		Galaxy: More of a directory than a search engine. Launched in 1994, Galaxy was the first searchable Internet directory. Part of the Einet division at the MCC Research Consortium at the University of Texas, Austin
		search.aol: Now powered by Google.
		Live Search (formerly Windows Live Search and MSN Search) Microsoft’s web search engine, designed to compete with Google and Yahoo!. Included as part of the Internet Explorer web browser.
		Lycos: Initial focus was broadband entertainment content, still a top 5 Internet portal and the 13th largest online property according to Media Metrix.
		GigaBlast was developed by an ex-programmer from Infoseek. Gigablast supports nested Boolean search logic using parenthesis and infix notation. A unique search engine, it indexes over 10 billion web pages.
		Alexa Internet: A subsidiary of Amazon known more for providing website traffic information. Search was provided by Google, then Live Search, now in-house applications run their own search.

ADVANTAGES AND DISADVANTAGES OF SEARCH ENGINES

There are three very compelling advantages of most search engines.

1. The indexes of search engines are usually vast, representing significant portions of the Internet, offering a wide variety and quantity of information resources.
2. The growing sophistication of search engine software enables us to precisely describe the information that we seek.
3. The large number and variety of search engines enriches the Internet, making it at least appear to be organized.

On the other hand, disadvantages

1. Regardless of the growing sophistication, many well thought-out search phrases produce list after list of irrelevant web pages. The typical search still requires sifting through dirt to find the gems.
2. Using search engines does involve a learning curve. Many beginning Internet users, because of these disadvantages, become discouraged and frustrated.
3. Do you have a hard time finding the right lesson for your child?

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