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A fairly common question I hear from people is whether it is better to create web pages in a subdomain, such as ‘seo.techwyse.com’ or in a subfolder such as ‘techwyse.com/seo/’.
Webmasters, in many cases are not clear on why to choose one way over the other and do not understand that deciding one of these ways can help greatly in ranking better on search engines.
First of all a bit of a better understanding is needed of domains and subdomains. Pre 2007, Google treated all subdomains like they are there very own domain which is unrelated to the main domain. ‘finance.gm.com’ was different from ‘gm.com’. This method was often referred to as host crowding. Since Google only liked to display 2 ‘finds’ per domain, this would challenge that result. What could happen instead was that a company like GM could have an entire page of searches dedicated to them.
For example, if i did a search for General Motors and they utilized sub domains, the first 10 results might be from:
gm.com, finance.gm.com, dealers.gm.com, careers.gm.com, parts.gm.com, buick.gm.com, cadillac.gm.com, gmc.gm.com, hummer.gm.com, pontiac.gm.com
In December of 2007 Google made a tweak to their algorithm to make this scenario less likely to happen. They began to favour subdomains quite so much.
In general, i don’t usually recommend the usage of sub domains however, if you really must…
Be sure the the content is distinctly unique from the main domain, and that you have lots of content for it.
The other benefit to sub domains, is for branding purposes. Since a sub domain is looked upon as a new and separate domain, you may have a preference to having cadillac.gm.com instead of cadillac.com. In this case they would be sectioning off the content on a separate domain for branding purposes.
The biggest issue with sub domains, is search engines view them as separate sites. Therefore they have the equivalency of separate domains.
With a sub domain, you now have to think about developing it as its own entity. This means bringing in inbound links from other web sites. If, for example you have worked hard to bring in 1,000 inbound links to your main domain, you now have to bring in 1,000 links to your sub domains if you expect similar results, and if you have many of them, you are really piling up the workload for yourself.
That’s a very simplistic way of looking at it, but it’s usually enough to sway people to avoid sub-domains.
Finally, another negative is that links from the sub domain to the main domain will be looked at as inbound links rather than an internal link and therefore will not distribute link juice.
There has also been a history of SEO’s and webmasters using sub domains for spam tactics, which is partially what stemmed Google to filter out overly repetitive sub domains returning in search results.
My recommendation when building out your web site is to use folders wherever possible. Aside from the sub domain vs sub folder issue, folders are a nice way to keep your content themed and grouped and helps to keep your web files neatly organized. This is especially useful for larger web sites.
For SEO purposes one of the benefits of using sub folders is that those pages will leverage the power of the main domain and will receive a trickle-down effect from the inbound links the main domain has received. In addition, cross-linking from these pages will be natural internal content links and not considered inbound, to allow for link juice to continue to flow through through the site.
Another factor of search engine rankings are the number of pages a web site contains. A sub folder will increase those numbers, a sub domain will not.
The only purpose I see to using subdomains is really for branding purposes. Usually those purposes are seen more greatly by larger corporations or if you want to establish a separate entity that is still linked visually to your main domain.
You can perhaps look at this blog itself for that!
In most cases, however, I strongly suggest going the other route. For so many reasons, sub folders are better. They help you grow the relevancy of your core domain, and they are even easier to remember for visitors.
Since I am an SEO guy, unless there is an extreme case make sure when facing this very question that you go with sub folders instead of a subdomain!
For those looking for further research on this issue, I urge you to read the following two articles. This article is my opinion based upon my industry knowledge. The facts delivered by these two were current as of December 2007. Although they reported them as factual, the end results do not seem to support many of the claims that I read in the articles.
1. SEO Book
3. Gotta Quirk
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