Snap and Lycos are directories.
Ask Jeeves is an Answer Service and is more like a directory as human
beings compile its listing. Users pose questions in plain English and
receive links to Web sites containing relevant information, services and
Engines and Directories Explained
is important to understand the differences between search engines and
directories. It is also important to understand the way in which search
engines work before discussing how a web site can be found effectively
engines create their listings automatically. They crawl the web and users
search through what they have found. When a web page is changed, search
engines find these changes and this can affect the web page listing. Page
titles, site content and other elements all play a role.
of sites are submitted to the directory or sites are reviewed by editors.
The search then looks for matches in the descriptions submitted. Changing
web pages has no effect on the listing. Factors affecting directory
listing are different to those affecting search engine listings. Sites
with extensive and original content are more likely to get reviewed than a
poor site. Therefore the key to a good directory listing is to have a
well-designed site with extensive and original content.
search engines maintain an associated directory. Being included in a
search engine’s directory is usually a combination of luck and quality.
Sometimes you can “submit” your site for review, but there is no
guarantee that it will be included.
major elements of a Search Engine:
Also called the crawler. The spider visits a web page, reads it, and
then follows links to other pages within the site. Hence the term a site
being “spidered” or “crawled”. The spider returns to the site on a
regular basis, such as every month or two, to look for changes. This can
have an effect on website statistics, boosting the number of website hits,
when in reality neither surfers nor users are visiting the site.
The Index: The spider puts
everything it finds into the index. The index, also called the catalog,
contains a copy of every web page that the spider finds. If a web page
changes, the index is updated with new information. Sometimes a new page
or a page that has been changed will have been spidered but not yet
indexed. Until it is indexed it will not be available to those searching
with the search engine.
Search Engine Software:
This is the program that sifts through the millions of pages recorded
in the index, finding matches and ranking in order of relevance.
Search Engines Rank Web Pages
engines rank web pages on the basis of how relevant they find them in
relation to certain topics. The primary rules that search engines use for
determining relevancy are position and frequency.
engines assume pages with keywords appearing in the title are more
relevant to the topic than pages without. Search engines also check to see
if the keywords appear near the top of a web page, such as in the headline
or in the first few paragraphs of text. They assume that any page relevant
to the topic will mention those words right from the beginning.
engines analyze how often keywords appear in relation to other words in a
web page. Those with a higher frequency are often deemed more relevant
than other web pages.
search on different search engines may produce different results. Search
engines vary in the number of pages indexed and in the frequency that they
index web pages. Therefore no search engine has the exact same collection
of web pages to search through.
engines may also improve a pages ranking for certain reasons. For example
the search engine Excite uses link popularity as part of its ranking
method. The search engine can tell which pages in its index has a large
number of links pointing at them. Such a page would have its ranking
improved as it is probably well regarded on the Internet.
search engines may give relevancy boosts to sites that they’ve reviewed.
Their logic is that because a site was good enough to review it’s more
relevant than an unreviewed site.
page designers may repeat a word hundreds of times on a page to increase
the frequency and improve the pages ranking. However search engines watch
for this and may detect it easily. If a search engine detects search
engine spamming it may penalize or exclude the page from its index. Search
engines are becoming more adept at recognizing spamming techniques.
importance of top Search Engine Ranking
search engines often return thousands of search results, usually only the
10 most “relevant” results are initially displayed. Quite often a user
may find a site that satisfies their requirements in the first 10 results.
Such a user may not see any need to look through the remaining results.
Therefore it is essential that a website is in the “top ten” results.
to Improve Search Engine Ranking