1. What are the advantages and disadvantages of using search engines?
Advantages:
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.
Source: http://www.gsn.org/web/research/internet/advtse.htm
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.
2. Compare and Contrast individual search engines and search meta search engines.
Contrast:
Individual. Individual search engines compile their own searchable databases on the web.
Meta. Metasearchers do not compile databases. Instead, they search the databases of multiple sets of individual engines simultaneously.
Source: http://www.sc.edu/beaufort/library/pages/bones/lesson1.shtml
Comparison:
They are both programs that searches papers for particular keywords and returns a list of the documents where the keywords were found.
3. When is it appropriate to use a search engine? When is it appropriate to use as subject/search directories?
It is appropriate to use search engine when you want to find things faster and more organized. Since in search engines, they can give what you are looking for alphabetically because it has like a table contents and you know where you will get the good information about the thing that you want to know since it also has an index.
4. What is an Invisible Web or Deep Web?
It mainly refers to the vast repository of information that search engines and directories don't have direct access to, like databases. Unlike pages on the visible Web (that is, the Web that you can access from search engines and directories), information in databases is generally inaccessible to the software spiders and crawlers that create search engine indexes.
Source: http://websearch.about.com/od/invisibleweb/a/invisible_web.htm
5. How do you find an Invisible Web?
You can find searchable databases containing invisible web pages in the course of routine searching in most general web directories. Of particular value in academic research are:
Use Google and other search engines to locate searchable databases by searching a subject term and the word "database". If the database uses the word database in its own pages, you are likely to find it in Google. The word "database" is also useful in searching a topic in the Google Directory or the Yahoo! directory, because they sometimes use the term to describe searchable databases in their listings.
Examples:
plane crash database
languages database
toxic chemicals database
Remember that the Invisible Web exists. In addition to what you find in search engine results (including Google Scholar) and most web directories, there are other gold mines you have to search directly. This includes all of the licensed article, magazine, reference, news archives, and other research resources that libraries and some industries buy for those authorized to use them.
As part of your web search strategy, spend a little time looking for databases in your field or topic of study or research. The contents of these may not be freely available: libraries and corporations buy the rights for their authorized users to view the contents. If they appear free, it's because you are somehow authorized to search and read the contents (library card holder, company employee, etc.).
Source: http://www.lib.berkeley.edu/TeachingLib/Guides/Internet/InvisibleWeb.html
6. Why are these web pages not available in search engines or subject directories?
It is very difficult to predict what sites or kinds of sites or portions of sites will or won't be part of the Invisible Web. There are several factors involved:
- Which sites replicate some of their content in static pages (hybrid of visible and invisible in some combination)?
- Which replicate it all (visible in search engines if you construct a search matching terms in the page)?
- Which databases replicate none of their dynamically generated pages in links and must be searched directly (totally invisible)?
- Search engines can change their policies on what they exclude and include.
Source: http://www.lib.berkeley.edu/TeachingLib/Guides/Internet/InvisibleWeb.html
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