Search Engines Meta Engines People Directories Subject Directories Domains explained

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Contents. Search Engines Meta Engines People Directories Subject Directories Domains explained URLs explained Hypertext Language. Search Engines. Use when looking for information about a specific topic. E.g. Bastille day. When will I use them?. - PowerPoint PPT Presentation

Transcript of Search Engines Meta Engines People Directories Subject Directories Domains explained

Page 1: Search Engines Meta Engines People Directories Subject Directories Domains explained
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• Search Engines• Meta Engines• People Directories• Subject Directories• Domains explained• URLs explained• Hypertext Language

Contents

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Search Engines

When will I use them?

• Use when looking for information about a specific topic.

E.g. Bastille day

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Search Engines

What are they? How do they work?

• Search engines allow keyword searches on the World Wide Web.

• Information is gathered by programs called robots or spiders.

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AllTheWebhttp://www.alltheweb.com/

Googlehttp://www.google.com/

Hotbothttp://www.hotbot.com/

Useful Search Engines

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Meta Engines

How do they work?• Meta engines are

programs which query multiple web sources (search engines, web directories and/or other specialized databases). They do not have their own databases.

• They send queries simultaneously to their specified web sources (varies with each meta engine). Many of them integrate the search results and rank according tovarious criteria.

What are they?

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Meta Engines

When will I use them?

• Use these engines when you want the highest recall of documents on a specific subject.

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Beaucouphttp://beaucoup.com/

Ixquick Metasearchhttp://www.ixquick.com/

Profusionhttp://www.profusion.com/

Useful Meta Engines

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People Directories

What are they? How are they organized?• People directories are

often referred to as ‘whitepages’ and include directories of email and snail mail addresses and telephone numbers.

• The information is gathered by robots or by submissions by individuals.

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People Directories

When will I use them?

• Use when looking for email and snail mail addresses and telephone numbers.

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WhoWherehttp://www.whowhere.com/

IAF (Internet Address Finder)http://www.iaf.net/

Whitepageshttp://wp.superpages.com/

Useful People Directories

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Subject Directories

What are they? How are they organized?

• An index or catalog of Web sites.

• They are organized by humans.

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Subject Directories

When will I use them?

• Use when looking for general information about a topic.

E.g. education, medicine

• Use when looking for a list of sites which have been selected by human experts.

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LookSmarthttp://www.looksmart.com/

Lycoshttp://www.lycos.com/

Yahoohttp://www.yahoo.com/

Useful Subject Directories

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Domains Explained

What are they?• A domain name is a meaningful and easy-

to-remember “handle” for an Internet address.

• The domain name system (DNS) is the way that internet domain names are located and translated into computer addresses.

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Domains Explained

How do they help?• The DNS includes:

• Name of country e.g. ca for Canada e.g. fr for France E.g. au for Australia

• Type of organization e.g. com for commercial e.g. edu for educational e.g. gov for government

• Name of organization e.g. brown for Brown University

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URLs Explained

• URLs areWorld Wide Web addressesU = UniformR = ResourceL = Locator

What are they?

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URLs Explained

An example

• The URL for Brown University is:

http://www.brown.edu

• Typically a WWW address includes:

• http:// - hypertext transfer protocol• www - World Wide Web• brown - name of the organization• edu - type of organization

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Web Browsers

What are they?• The web browser is a software program

installed on your PC that lets you look at (or “browse”) websites.

• Popular browsers include:– Internet Explorer, Netscape, and Mosaic.

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Hypertext links

What are they?• The Web is based on a system called

hypertext markup language (HTML).

• Hyperlinks are used to link information within documents and between documents on the World Wide Web.

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Hypertext links

Recognizing hyperlinks• Hyperlinks appear as:

Icons Images Text

• Text links are commonly a different color and are usually underlined.

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Works Cited

Henninger, M. Don’t Just Surf: Effective Research Strategies for the Net. Sydney: U of New South Wales Press Ltd, 1999.

Tyner, R. “Internet Search Tools & Techniques.” 19 June 2001 M.L.S. Okanagan U College. 4 Oct. 2001 <http://www.sci.ouc. bc.ca/libr/connect96/search.htm>.

Barlow, L. “How Search Engines Work.” The Spider’s Apprentice: A Helpful Guide to Search Engines. 22 Sept. 2001. Monash Information Services. 4 Oct. 2001 <http://www.monash.com/ spidap4.html/>.

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