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Search
Engine Breakdown
How do
search engines work?
The term
search engine is often used to describe both true search engines
and directories. They are not the same.
Search
Engines vs Directories
Search
Engines: Search engines create listings automatically by crawling
a URL, (unified resource locator), and compiling information
about that web site into a database. When "searching"
one of these databases, results are presented giving emphasis
on certain criteria. The methodology of this search and delivery
is known as an algorithm.
If you
change one of your web pages, search engines eventually find
those changes, which can affect how you are listed.
Directories:
Directories such as Yahoo!, are maintained by humans who review
inclusion requests of URLs. The human editors then divide
these web sites into categories accordingly.
You submit
a short description to the directory for your entire site,
or editors write one for sites they review. A search looks
for matches only in the descriptions submitted.
The Parts
Of A Search Engine
Search
engines have three major elements:
The spider,
also referred to as a crawler, visits a web page, reads it
and then follows links to other pages within the site. This
is what it means when someone refers to a site being "spidered"
or "crawled." Some spiders may return as much as
once per day while others spider every few months.
Information the spider deems useful goes into the second part
of a search engine known as the index, sometimes called the
catalog or database. If a web page changes, the index is updated
with the new information when the spider returns.
Search engines determine relevancy for specific keywords based
upon an advanced set of rules, typically referred to as an
"algorithm." Algorithms utilize several criteria
when determining where websites rank for specific keywords.
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