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HTML
Meta Description Tag
Allows page authors to say how they
would like their pages described when
listed by search engines. Not all search
engines use the tag.
Meta Keywords Tag
Allows page authors to add text to a
page to help with the search engine
ranking process. Not all search engines
use the tag.
Meta Robots Tag
Allows page authors to keep their web
pages from being indexed by search engines,
especially helpful for those who cannot
create robots.txt files. The Robots
Exclusion page provides official details.
Pixel
Short for picture element (Pixel), a
pixel is a measurement representing
a single point in a graphic. Most ad
units are measured in pixels such as
the common 468 pixel x 60 pixel sized
banner.
Referrer
The address (URL) of the web page a
user came from, before entering another
site. Each time a user clicks (selects)
a new HTML link on a web page, most
browsers report a "HTTP-REFERER"
string to the new site. Web hosts can
record these "referer strings"
in a log file for usage by a web site.
In the context of search engines, these
referer strings are a powerful way to
determine what searches users used to
enter your website. As part of a referral
string from search engine, the search
terms a user typed in will be included.
Some img tag counter style logging software
can also record referral strings.
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