Tech essentials test Flashcards
Individual search engine
engines that search their own databases on the Internet.
Meta search engine
–searches the databases of multiple sets of individual engines simultaneously from a single site and using the same interface
advantages of Meta search engines
Meta search engines are very fast.
These engines are a quick way of finding out which (individual) engines are retrieving the best results for you.
Provides an overview of a subject/term
Advantages of individual search engines
Individual search engines provide a wide range of responses to specific queries.
disadvantages of Meta search engines
When using a Meta search engine it will not return all of the results retrieved from the individual engines
Subject directories
unlike search engines, are created and maintained by human editors. The editors’ review and select sites for inclusion in their directories on the basis of previously determined selection criteria.
Portals
Are directories that have been created or taken over by commercial interests and then reconfigured to act as gateways to the web.
Advantages of Subject Directories
Subject directories are best for browsing and for searches of a more general nature (great for popular topics, organizations, commercial sites, and products).
Advantages of portals
Portal sites not only link to the popular
subject categories, but they also offer additional services such as email, current news, stock quotes, travel information, and maps.
Disadvantages of Subject Directories
Subject Directories tend to be smaller than search engine databases (typically indexing only the home pages or top-level pages of a site).
Search Tips/Examples (only need 3)
Be Specific Dublin Core metadata
✓ Whenever possible, use nouns and objects as keywords Hurricane Hugo
✓ Put most important terms first in your keyword list +hybrid+electric+gas+vehicles
✓ To ensure that they will be searched, put a +sign in front of each one
✓ Use at least two or three keywords in your query vitamins drugs interaction
✓ Combine keywords, whenever possible, into phrases “search engine tutorial”
✓ Avoid common words, e.g., “green” unless they are part of the phrase “green tea”
✓ Think about words youʼd expect to find in the body of the page,
and use them as keywords Anorexia bulimia eating disorder
AND
When this operation is used during a search only documents that contain every one of the keywords you enter.
The more you enter, the narrower your search becomes.
OR
When this operation is used during a search more documents will be returned in which either or both keywords appear. Since the OR operation is usually used for keywords that are similar or synonymous.
The more keywords you enter, the more documents you will retrieve.
NOT or AND NOT
When these operations are used during a search, the search is limited by returning only your first keyword but not the second, even if the first word appears in that document, too.
hhh
hh
