1 what are the advantages and disadvanatages of using search engines?
Advantages:
o The first and foremost advantage of SEO is that it helps you in increasing the traffic to your
website via various search-engines by improving the visibility of your website to the public.
Disadvantages
-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.Using search engines does involve a learning curve. Many beginning Internet users, because of
these disadvantages, become discouraged and frustrated.
http://www.globalschoolnet.org/web/research/internet/disadse.htm
Advantages
-There are three very compelling advantages of most search engines.
a. The indexes of search engines are usually vast, representing significant portions of the
Internet, offering a wide variety and quantity of information resources.
b. The growing sophistication of search engine software enables us to precisely describe the
information that we seek.
c. The large number and variety of search engines enriches the Internet, making it at least
appear to be organized.
http://www.globalschoolnet.org/web/research/internet/advtse.htm
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2 when is it appropriate to use a search engine?
There are search engines that finally bring your website to the attention of prospective customers.
When a topic is typed for search, nearly instantly, the search engine goes through millions of pages
it has indexed about you and those that match your topic. The results are also searched row, so that
the most relevant come first.
Remember that the prospective customer will probably only watch the first 2-3 pages of search
results. So it does matter that your site appears in search engine ranking.
In addition, they all use one of the major search engines and 6-7 of these search engines attract
more visitors to websites than anything else. So finally it all depends on which search engines the
customers use and how they rank your site.
It is the keywords that are important as any expensive online or offline advertising of your
website.
It is found by surveys that when customers want to find a site for information or to purchase a
product or service, they find their place in the following ways:
• The first option is they find their place through a search engine.
• Then they found their site by clicking on a link from another website or page that relates to the
question that interests them.
• Sometimes, they find a site heard from a friend or reading in an article.
Thus, it is clear that the most popular for finding a site, search engine, represents more than 90%
of online users. In other words, only 10% of people looking for a website to use methods other than
search engines.
All search engines use a ranking algorithm and one of the main rules in a ranking algorithm is to
verify the location and frequency of keywords on a web page. Do not forget that algorithms weightage
to link population (number of web pages linking to your site). When performed by a qualified,
experienced consultant search engine optimization, your site for search engines does not really work
unless you have lots of money and can afford to pay the expert. With a better knowledge of search
engines and how they work, you can also do it yourself.
http://www.365seocare.com/importance-of-search-engines
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3 what is an invisble web or 'deep web'?
-The portion of the Web not accessible through Web search engines.
http://www.marketingterms.com/dictionary/invisible_web/
Web sites or pages that search engine spiders cannot or will not crawl because the content is locked
up in a database.
www.simply.com.au/glossary.php
how do you find an Invisible web?
How to Find the Invisible Web
Simply think "databases" and keep your eyes open. 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:
* ipl2
* Infomine
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.).
http://library.berkeley.edu/TeachingLib/Guides/Internet/InvisibleWeb.html
why are these web pages not available in search engines or subject directories?
Why isn't everything visible?
There are still some hurdles search engine crawlers cannot leap. Here are some examples of material
that remains hidden from general search engines:
* The Contents of Searchable Databases. When you search in a library catalog, article database,
statistical database, etc., the results are generated "on the fly" in answer to your search. Because
the crawler programs cannot type or think, they cannot enter passwords on a login screen or keywords
in a search box. Thus, these databases must be searched separately.
o A special case: Google Scholar is part of the public or visible web. It contains
citations to journal articles and other publications, with links to publishers or other sources
where one can try to access the full text of the items. This is convenient, but results in Google
Scholar are only a small fraction of all the scholarly publications that exist online. Much more -
including most of the full text - is available through article databases that are part of the
invisible web. The UC Berkeley Library subscribes to over 200 of these, accessible to our students,
faculty, staff, and on-campus visitors through our Find Articles page.
* Excluded Pages. Search engine companies exclude some types of pages by policy, to avoid
cluttering their databases with unwanted content.
o Dynamically generated pages of little value beyond single use. Think of the billions of
possible web pages generated by searches for books in library catalogs, public-record databases,
etc. Each of these is created in response to a specific need. Search engines do not want all these
pages in their web databases, since they generally are not of broad interest.
o Pages deliberately excluded by their owners. A web page creator who does not want
his/her page showing up in search engines can insert special "meta tags" that will not display on
the screen, but will cause most search engines' crawlers to avoid the page.
http://library.berkeley.edu/TeachingLib/Guides/Internet/InvisibleWeb.html
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