searching the world wide web
DESCRIPTION
Searching the World Wide Web. CMP 101 Introduction to Information Systems. L02. Internet Search. What is the World Wide Web?. Billions of Documents Accessible via the Internet Viewed by a web browser . Web documents contain hyperlinks - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/1.jpg)
1
Searching the World Wide WebCMP 101Introduction to Information Systems
L02. Internet Search
![Page 2: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/2.jpg)
2
What is the World Wide Web?
Billions of Documents– Accessible via the Internet – Viewed by a web browser. Web documents contain hyperlinks – Allow readers to jump from one web
document to another– Gateways to audio and video broadcasts,
animations, and more.
![Page 3: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/3.jpg)
3
What is a Search Engine?A collection of software – Locates words on web pages– Ranks and indexes the words– Creates a database that you can
search. When using a search engine, you search the database that has been created (not the Web).
![Page 4: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/4.jpg)
4
How Does a Search Engine Work?
Robots, Spiders, Crawlers – Oh My!– visits web pages – collects words and hyperlinks– gives words to the search engine for
ranking and indexing– differing strategies for crawling yield
different results
![Page 5: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/5.jpg)
5
How Does a Search Engine Work?
Ranking and Indexing – Meta-information
• the number of times a word appears on a page• the word’s location on a page• other much more sophisticated information.
– differing strategies yield different results
![Page 6: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/6.jpg)
6
Subject DirectoriesCategorical listing of topics with links to individual web sites. Created with the help of human editors Editors rate and rank the sites Good for narrowing down a topic or browsing a large list of topics.
Examples include: Yahoo! Directory (dir.yahoo.com), and Gigablast (gigablast.com).
![Page 7: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/7.jpg)
7
Individual Search EnginesCreate and maintain a database of indexed and ranked words for searching. Good to use if looking for specific information about a topic.
Examples Include: Google (google.com), Yahoo! Search (yahoo.com), and Ask (ask.com).
![Page 8: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/8.jpg)
8
MetasearchersSearches multiple individual search engines Presents results in one convenient list. Good to use to get a feel for how much information is available on a topic.
Examples include Dogpile (dogpile.com), Mamma (mamma.com), and Clusty (clusty.com).
![Page 9: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/9.jpg)
9
Search strategy kickoffDetermine your needs:
What are youlooking for? Type of search Examples
Broad range of topics in a specific category
Subject Directory
Astronomy Football
A lot of information about a specific topic.
Meta-search engine
Aurora Borealis (Northern Lights)
Indianapolis Colts
Specific facts Individual Search Engine
Aurora Borealis particle speed
Peyton Manning’s passing statistics
![Page 10: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/10.jpg)
10
Basic Search TechniquesBe specificPut words in the order you would normally expect them to appear.Avoid using common words.Consider synonyms.Use search focus options: (i.e. images, videos, or blogs).
![Page 11: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/11.jpg)
11
Advanced Search Techniques
Boolean logic (AND, OR, NOT): – Boolean AND
• Include all words. • Narrows your search.
– Boolean OR• Include any of the words• Broadens your search. • Useful for synonyms.
– Boolean NOT or AND NOT• Excludes words• Narrows your search
![Page 12: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/12.jpg)
12
Advanced Search Techniques
Implied Boolean operators (+, -)– Used in place of the Boolean AND and
Boolean NOT. Phrase searching (“ “)– Place quotes around a phrase.– Returns documents where the words
appear as a phrase (side by side).Wildcards (*): – Used for plurals, alternative endings, or
alternative spellings,
![Page 13: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/13.jpg)
13
Advanced Search Techniques
Advanced search form– With all the words: Same as using the
AND or plus (+) operator.– With at least one of the words:
Same as using the OR operator.– With the exact phrase: Same as
using quotes.– Without the words: Same as using
the NOT or minus (-) operator.
![Page 14: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/14.jpg)
14
Analyzing resultsScan through the first five to ten pages of results. Consider synonyms.Use the NOT or minus (-) operator.Broaden your search.Narrow your search.
![Page 15: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/15.jpg)
15
Odds and EndsSearch engines ignore some pages.– dynamic (created on demand) such as
a request for account information, – require registration or a login (like the
Wor-Wic research databases).database not always up-to-date.
![Page 16: Searching the World Wide Web](https://reader035.vdocuments.pub/reader035/viewer/2022070501/56816930550346895de07c7d/html5/thumbnails/16.jpg)
16
Odds and EndsSearch within a site.
Search for individual words or phrases on a page – Edit > Find on this page… on the
menu– Search List arrow,
Find on this Page….