Web directories are usually maintained better by human actions than
by automated software. Computers still cannot determine the relevancy of certain text as
effectively as humans. A good example of a human edited directory is dmoz - Open Directory Project. It
is the largest and most comprehensive human-edited directory on the Internet, maintained
by thousands of volunteer editors.
Search engines are yet another tool to help find information on the Internet. There are
many search engines but the biggest and the most popular are Google, AOL/Netscape, Lycos
and MSN. Some of them also have their own web directories, which are often comprised of
dmoz data combined with their own data.
Search engines, however, are different from web directories. They do not categorize links
to web places like web directories do but they allow users to "search the
internet" using specific search terms. However, what is really being searched at the
moment you submit an inquiry (in the form of a search term) is, in fact, a database. These
databases are constantly updated and upgraded with so called 'search engine spiders' which
search the Internet all the time looking for new and recently updated websites.
So what search engines can help you do is to find which pages contain, and are the most
relevant to, the search term you have used. For determining the relevancy of a page to the
search term, they use complex algorithms which are not completely revealed to the public.
The reason is these algorithms, once known, could then be used to adjust a site's ranking,
ignoring the fact that the content of the website must be relevant to what people are
searching for. Search engines want visitors to return to their websites and thus need to
provide quality.
What are effective ways to use seach engines
to obtain relevant information?
Here are a few simple tricks many people do not know using various search engines. Let's
look at Google, since Google (http://www.google.com) is the most popular, and thought by many the most
comprehensive, search engine.
When you search for something on Google you may get a variety of results, some more and
some less relevant to the original search inquiry. For example, you may end with results
from various newspaper articles that merely mention the search term, but the content may
be totally unrelated to the search inquiry. A good technique to minimize those unrelated
results are to place "intitle:" or "allintitle:" before your search
terms.
The "intitle:" option is used when you search for a single word and anything you
write after that word will not be affected by the intitle option. So if you want a phrase
to be affected by the intitle option you will use "allintitle:" instead. E.g.
"intitle:cars" but "allintitle:used cars" (without the quotation
marks). Note that there should be no space between the colon and your search term.
A similar effect can be accomplished with the options "inurl:" and
"allinurl:" but here Google will restrict the results to show only those results
where the URLs contain the word or phrase you have searched for.
If you a definition, Google offers help here too. You have to type "define:"
(without the quotation marks) followed by the word or words you want defined. If Google
has come up with that definition on the Internet it will be displayed for you at the top
of the search results. Please note that if you enter more words after "define:"
Google will see those words as a phrase.
When you have the URL of a website that interests you (e.g. www.example-url.com) you can
find all the websites that link to that site, all the websites related (similar) to that
site and check what info Google has on that particular site.
You will use "link:" followed by
the URL of your choice (e.g. "link:www.example-url.com" - without the quotation
marks) when you want to find all websites that link to that site. The prefixes
"related:" and "info:" are used in the same way.
Should you wish to search only a certain website, not the whole Internet, you can use
"site:" following with the URL of the website you wish to search. But note that
the search term here comes BEFORE the "site:" which is followed by the URL of
the website. E.g., "download linux site:www.linux.org".
The only time the quotation marks are used in searching is when you are searching for a
phrase and not combined with any of the above mentioned prefixes. For example,
"searching the internet" with quotation marks will search for the exact phrase
and "searching the internet" without quotation marks will search for the places
where the words "searching", "the" and "internet" appear not
strictly in that order. Logically by using quotation marks when searching you will get
fewer results but more relevant ones while without the use of the quotation marks you will
get more but usually less relevant results.
This explanation and these little tricks should help you use the Internet more efficiently
in the search for information and should improve the quality and relevance of your search
results.