Internet Literacy & WEB searching basics. Web Searching Basics. The Internet is. a major presence in our daily lives constantly growing helping make an enormous amount of information available. Browsers & Search Engines. Browsers are software that allow you to look at Internet content. - PowerPoint PPT Presentation
Internet Literacy&WEB searching basicsWeb Searching Basics2The Internet isa major presence in our daily livesconstantly growinghelping make an enormous amount of information available
3Browsers & Search EnginesBrowsers are software that allow you to look at Internet content.Firefox, Google Chrome, Internet Explorer, Opera, Safari, etc.
Search Engines are programs that allow you to search the Internet.Top 5 Search Engines:Google, Yahoo!, Bing, Ask, AOL Search Top 5 Meta Search EnginesDogpileClustyMamma
4Metasearch engines enable users to enter search criteria once and access several search engines simultaneouslyTop Web Sitesaccording to GoogleUses popularity to rank web sitesCounts the number of links from sites all around the WebFor Example: If a large number of sites have a specific keyword somewhere on their website along with a link to a particular site, Google counts the number of times the keyword appears along with the number of links to a particular site. The higher number of links to a site, the higher Google will rank that site on a list of results.
Top 5 Web Sites Are:FacebookYahooLive.comWikipediaMSN
More about Search EnginesThey only search a TINY section of the web and index it.
Search Engines have three basic functions:SearchStoreDeliver7Search Uses spiders, robots or webcrawlersSoftware programmed by the search engine to follow links and to gather informationGoes to only selected parts of the Internet scanning for text, links, and the URLIt then builds a list of words & where to find them
8This is how the search engines gather the hits the user sees when they browse for a particular subject.StoreSearch Engines create a list of keywords & where to find them in an indexEach Engine creates guidelines to determine what is stored Indexes for different search engines will not store the exact same information
(so its a good idea to use more then one search engine)
9Deliver (Give results)Search Engines match the keywords of the user to the keywords in the indexProduces a ranked list of websites, web documentsEach search engine uses a different set of rules for ranking the results
So10When you use a search engine, you are not searching the current web
But rather the index created by the search engine to organize the information previously collected by the spider.11So what are you missing?
Everything that isnt on the surface.Thedeep Webis about500 times biggerthan the surface Web.
The Deep Web is all information that is inaccessible through search engines. This would include private databases, like the ones the library subscribes to through Galileo.
12Types of SearchesIndex Searches (Directory)Natural language SearchesConcept/keyword SearchesThere are other types. For example some searches use more then one search engine to improvehits. This is called a Meta-Search engine. One example http://www.clusty.comIndex SearchesA Directory of cataloged, hierarchically, structured lists of web sites, like the yellow pages of a phone directory. Good for broad topics, the big picture, top down. (search for online mortgages). Limited web site inclusion and not good for complex or specific concept/keyword searches.
Typically these are evaluated for popularity, content and/or quality before being included Example:http://www.yahoo.com/ Then check directory on left sideTry Yahoo and search for information about ChocolateNatural language SearchesA directory of possible questions. Good for frequently asked questions, use on simple questions, -least comprehensive in sites included in search
Creators developed general question structures that can be asked about a topic
A question is typed into the question box, possible alternative statements of the question are then given, followed by links for possible answers. Example:
http://www.ask.com/Try Ask Jeeves and ask for information about ChocolateConcept/Keyword SearchesStructured to the user as a traditional library database. Good for specific searches e.g stain removal and complex esoteric topics e.g. multiple melanoma. Not good for top down general searches. Google at last report indexes the most web pages of all search engines.
Bots search the web for concepts/keywords picked by web site creators. Most organize the sites in terms of relevance as determined by links to a site and/or actual frequency of access of a web page, hits.
Concepts/keywords are typed into the query box using Boolean logic and the search engines rules to limit the list to the most relevant. Example: www.google.comTry google and search for information about ChocolateImproving Searches using Logic with GoogleDescribe your search as completely as possible to focus returned links-- normally dont capitalize (e,g a search for carnivore obtains a game, a type of animal and an FBI program, so specify your term)history of chocolate
Add quotes to limit search to those sites with this specific phrase:history of chocolate
Limit search to non commercial sites:history of chocolate -.com
Check other rules of the search engine for focusing your searchOn Google Choose advanced search
Refine Your Search IMost search engines have an advanced search similar to Googles. Check them out!Boolean Logic for SearchesAND---requires both termschocolate AND history
OR-----finds either termchocolate OR Hershey
NOT---excludes termchocolate NOT mars
Nested Boolean Searcheschocolate AND [diet OR health]
How Boolean is used in advanced search on one engine:
Refine II.The exact syntax for logic varies with the search engine. On Google for example click Advanced Search to make choices. Review Search Logic at:
Other Search TechniquesProximity operatorse.g NEAR. A search for juveniles NEAR crime would return sources with juvenile and crime usually within a specified range such as 10 words (not available for Google)
Trunicatione.g *. Search for a specific beginning or ending with all possible for the unspecified part. Search for *hood would get parenthood neighborhood, etc. This is not available in Google
Phrase search my search phrase, available in Google and Teoma, etc.
Use and + instead of NOT and AND. Available in Google
What This MeansIf you are looking for general information about a topic of interest choose yahoo or askjeeves
If you have specific information and/or a possible topic with limited available information choose google
Practice with search engines, check their operation and rules to improve your search engine choice and limit extraneous information. You can check this list for possible search engines: Search Engine List
Keep up with new developments.Http://www.searchenginewatch.com/
Learn more from an online tutorial on performing searches
http://www.sc.edu/beaufort/library/pages/bones/bones.shtmlOther Types of Search Engines 1Meta-Searches; these organize links received from searches by more then one search engine. http://www.metacrawler.com/http://www.ixquick.com/http://www.dogpile.com/http://www.clusty.com
Specialized Search Engines
http://newslink.org Newspaper Articles http://www.searchmil.com Military Informationhttp://www.firstgov.gov/USA Government Sitehttp://www.switchboard.comDigital Phone Directoryhttp://www.wikipedia.comPublic Editable Encyclopedia http://www.clipart.com/ Imageshttp://www.apple.com/itunes/ Musichttp://www.napster.com/ MPMusic3 Audio now chargesOther Information SourcesSpecialized Information Searches
http://www.mayoclinic.com Medical advicehttp://www.fda.gov/cder/orange/default.htm FDAs Center for Drug Evaluationhttp://www.bizrate.com Store ratings and product prices.http://www.shopping.com Store ratings and product priceshttp://froogle.google.com/ Search for a product
URLUniform Resource Locator
Specifies where an identified resource is available and the mechanism for retrieving it
Examples:www.rcschool.netWeb extensions.com company.ac Higher ed outside of US usually used with country code, example ac.uk.sch school (used outside of US).net network.k12 most US school sites.mil US Military.edu US higher ed.co Company (if paired with a country code, example .co.uk, the state of Colorado or the country Columbia).org organization
.gov US government (add country code for outside US
.us American Web sites and is the newest extensionConducting a Search OnlineSearch for a list of academic institutions in South AfricaGo to any browser and type host:ac.za Search for US higher education websites that contain the word turtleGo to any web browser and type in host:edu + turtle in the search box.WebsitesFind the owner of a website by going to www.easy whois.com and entering the URL of the site you would like to research.Find out if a web site is someones personal website by looking for a tilde ~ or the % sign or a personal name jdoe or the word user after the domain name and the first forward slash /Find out who is linked to your organizations website by going to any browser and typing link:[your organizations website]Find the history of any given website by going to www.archive.org and entering in a website.BlogsA weblog or blog (a derivative of web and log)
Essentially an online diary, where anyone with a basic knowledge of computers can post anything random thoughts, photos, homework, and poetry, just to name a few for the rest of the world to see.
Examples:Yellow LanePolitics 1House of BlogInteractive Media SeminarQuestions