Domains?

What is Root Domains?

A root domain is the top level hierarchy of a domain. Root domains are purchased from registrars. The following are examples of root domains:

• *.example.com
• *.seomoz.org
• *.blogspot.com

What is Subdomains?

A subdomain is a "third level" domain name that is part of a larger, top level domain. For example, "blog.example.com" and "english.example.com" are both subdomains of the ".example.com" root domain. Subdomains are free to create under any root domain that a webmaster controls.

The two most common subdomain choices are:

• http://www.example.com (www is the subdomain)
• http://example.com (has no subdomain)

These are also the subdomains that commonly result in canonicalization errors.

What is SEO Best Practice?

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To maximize search engine referred traffic, it is important to keep each of the following elements in mind:

Slection Of Domain Name

There are a number of considerations when selecting a domain name. Among them are making the name short, easy to remember, and easy to type. It is also important that the name be easy to type into a browser. This is especially true for word of mouth advertising which forces people to type in domain names into their browser that they might not be familiar with.

Importance of Keyword in a Domains

Ideally, webmasters should strike a balance between finding a catchy, unique, brand friendly domain name with having a domain that contains keywords that they are trying to target. The benefit of a keyword rich domain is two-fold. First, the domain name itself is a key ranking factor that the engines consider when calculating ranking order. Second, having relevant keywords in a domain name is beneficial because the domain name is the text that other Internet users will use as anchor text when linking. Since keywords in anchor text are an important ranking factor, having these keywords in a domain name has a significantly positive impact on ranking.

Hyphens In Domain Name

For readability sake, a domain name that is longer than 3 words should be separated with hyphens. That said, use of hyphens also correlate with spamminess so domain names with more than 3 words should be avoided.

Non .com Top-Level-Domain (TLDs)

When a webmaster registers a domain name, they will be given the option to buy additional TLDs. In order to maximize the direct traffic to a domain, it is advised that webmasters should only buy a domain if the .com version is available. Additionally, it is not recommend that SEO conscious webmasters purchase low quality TLDs such as .biz, .info, .ws, .name, etc. as a means of increasing traffic.

What Is Subdomains or Sub-folders?

Since search engines keep different metrics for domains than they do subdomains, it is recommended that webmasters place link worthy content like blogs in subfolders rather than subdomains. (i.e. www.example.com/blog/ rather than blog.example.com) The notable exception to this is language specific websites. (i.e. en.example.com for english)

Buying & amp; Redirecting Domains

Buying web pages for their links and redirecting them to another site has long been a practice employed by SEOs. Though historically this has been effective, industry leaders (such as Danny Sullivan) post on buying domains suggest that Google largely devalues links from sites once they are expired or when ownership changes.

Domain Registration Length

The notion that domain registration length matters as a SEO factor is a myth. When asked about domain registration length Google's Matt Cutts said "To the best of my knowledge, no search engine has ever confirmed that they use length-of-registration as a factor in scoring. If a company is asserting that as a fact, that would be troubling. The primary reason to renew a domain would be if it’s your main domain, you plan to keep it for a while, or you’d prefer the convenience of renewing so that you don’t need to stress about your domain expiring."

Moving Domains

If a webmaster needs to move one domain to another, there are several critical factors to consider. It's also important to set up the redirects on a page-to-page basis such that sub-folders and deep content pages are redirected to corresponding sub-folders and deep content pages on the new domain. SEOs should avoid redirecting all pages from one domain to the homepage of another domain. For more information, see Danny Dover's step-by-step guide to How to Properly Move Domains.