How Google Works
Google
consists of a large collection of data centers.
These are in essence a series of warehouses containing
racks of PC hard drives. These drives send out
"Spiders" to visit every website that
Google has knowledge of and take a snapshot of
the website. The more important a website is considered
to be, the more frequent and in depth the spiders
will be. It is this snapshot that is used to rank
your website against your competitors, so at any
point in time the version of your site being used
by Google might be a month or more out of date.
Google runs datacenters in pairs so that in the
event of a hardware failure it can revert to the
previous months data. This often explains rank
bounces and spurious results in the short term.
Google
uses a series of measures known as an algorithm
in order to decide how much it likes your site. These
are in effect a series of questions such as "What
keywords are used in the page title?" "What
keywords are used in the page headings?"
"How many times are these keywords repeated
with the page text?" etc
The answers
to a list of several hundred questions are then
compared with the answers to all the other sites
that Google has knowledge of. This "score"
is then used to compile a list of results for
each and every search term and phrase.
Once Google
has decided what your page is all about, it runs
a popularity contest in order to decide how much
other websites like your site. To do this Google
adds up all of the links it can find on other
sites, and by giving each of these links a value,
your final ranking is decided.
Google
uses a "Page Rank" (PR) score to value
every site that it knows about. Whilst in itself
this score isn't massively important to your site,
it is important to the sites that you link to.
Every site is ranked from 0 - 10. In order to
rank as well as you can, you want to get links
from sites with the highest PR score as possible.
In much
the same way as with the "on page" factors,
the "off page" factors ( i.e. linking)
have many different criteria which can influence
how valuable the link is to you. By maximising
the link criteria a goos SEO will achieve top
ten results within the shortest practical timeframe.
Google
uses it algorithm to ensure that overly optimized
sites or those using "Black Hat" practices
are soon excluded from the listings. Google likes
to see what it calls organic growth, such as other
sites linking to your site over time rather than
a large block of new links being added all at
once. Large quantities of links added at once
imply that you are using a link farm or are buying
links which is not favoured.
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