Knowledge Base

A .edu backlink is a link to a website from a domain name with the .edu extension.
When an educational institution registers a domain name they will
usually have a .edu extension. These .edu domains are often valuable
sites to have linking to you because they can carry a lot of authority
and sometimes positively influence search engine results.

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In the study and profession of search engine optimization, black hat SEO is a term for illegal or extremely invasive techniques to manipulate search engine results.
An example of a black hat SEO method is hacking a website script to get
free links against the knowledge and will of the site owner. Some SEO
consultants might classify exploiting web scripts as grey hat, or
moderately acceptable, but they are an exception. It is never professional to engage in such methods in the business...

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Grey hat SEO is the realm of search engine optimization that isn't quite
totally black hat, but not quite totally white hat either. It refers to
methods and techniques for optimizing search engine performance that
are questionable in respect to the ethics and laws of online business.
For example, many SEO specialists would classify automated blog comment SPAM as grey hat (at best).

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The lines between SEO and SEM are a bit blurred, but in simple terms: Search engine optimization (SEO) is improving website visibility in search engines, usually by free methods like following HTML standards and building content.
Search engine marketing (SEM) is a type of online marketing that focuses on
search engines - this can include normal search results but also
PPC/paid search placement.
As such, search engine optimization is a part of search engine marketing.

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White Hat SEO is a casual term for using professional conduct in SEO.
Using professional, appropriate conduct in search engine optimization
means following the laws, regulations, and common online ethics of
search engine optimization. SEO consultants might argue over the details
of what classifies as white hat SEO instead of grey hat SEO, but white
hat SEO practices clearly rules out any illegal behavior or explicit
SPAM.
In simple terms, you could say that to many professionals...

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