The URLs and the navigation of a site does matter for SEO but the elements of site structure affect SEO don’t end here. Let’s take example of sub domains and sub directions. These are the structural elements that do not influence how Google rank results. The difference between pages in sub directory and when it’s on a sub domain might not be always huge, there are cases when it really matters if you use sub domains or sub directories.
The difference between a sub domain and sub directory
Before getting in details of advantages and disadvantages of sub domains and sub directories for SEO, let’s clarify the difference between them.
Basically, when you use sub domains, your URLs will look like this:
We have to notice the ‘sub domain’ part before your main domain. This will tell Google and our and visitors that content in the sub domain is spate from the content from other sites. It’s typically use for business site where the blogs are separate from the rest and it resides on a sub domain of its own blog. Companysite.com. Sites with forums also frequently separate the forum part on a sub domain, such as forum.contentsite.com.
Unlike sub domains that precede the domain name, sub directories follow it. Like this:
The difference is not purely in the syntax. It goes beyond that and it’s related to the type of content you have. This not a rule to use sub domain when use sub directories but basically if the good candidate for a separate site, then you with domains. If the content is not more than main content, you go to sub directories. You’re having blog about wed design; you can have separate sub directories for tutorials, free stuff, your artwork, etc., but put the shop where you sell templates and designs on a separate domain
SEO Benefits of sub domains
It’s hard to say if sub domains are better for SEO or not because it depends on many other factors. However in any case you would benefit from a separate domain when you have multiple pages for a single keyword.
Google use the limits the numbers of search results per domain, these are very irrelevant these doesn’t apply to sub domains. In other words you are having domain sub directories y u have 10 relevant results mostly Google will show only 2 or 3 of them, while your having 5 sub domains, their chances mostle2 or 3 of them , there include 5 sub domains chances are 2 or 3 results per sub domain (or 10-15 altogether) will be shown. However, don’t take this for granted and don’t rush to sub domain just to trick Google to show more result from your site ‐ this might not work and you will have wasted your time and effort.
Another advantage of sub domain for SEO is only one you can put keywords as sun domain names. This is good your main domain name lacks them –i.e. your main domain is healthsomething.com is having lots of stuff about addiction, it may sense create a separate sub domain addiction, it may create a separate sub domain with your keywords has more weight
SEO Drawbacks of sub domains
The advantage of sub domains for SEO are tangible, they are having draw backs. For instance sub domains are harder to set and manage.
Another disadvantage, and its major one, is the sub domains don’t inherit metrics from the main domain. This alone is enough to give the idea of using sub domains at all- since the sub domains are not inheriting metrics, this means you practically have to optimize them from scratch.
SEO Benefits of sub folders
If you are expecting long list of SEO benefits of sub folders, there no such list because its sub folders have only two advantages.
First to sub domains, with sub folders, you can have the keyword in your URL. Second, sub folders inherit the metrics of your root domain that means your site is doing well on a whole.
Any content in a sub folder automatically benefits from this, while sub domains you might have to start your SEO efforts from the very beginning.
SEO Drawbacks of sub folders
The main SEO disadvantage of sub folders is that they could limit your exposure, if search results are already saturated with pages from your site. As I already mentioned, Google generally limits the number of search results per domain to 2 or 3, so if you have more pages that are relevant, they might not show in the main search results.
When to use a sub domain and when to use a sub directory?
By using sub domains for lager topics-i.e., if you have health site, it will create separate domains for each major group of diseases and we have to create a sub folder for desperate diseases in this group.
Of course, these are just general recommendations and you don’t have to follow them blindly. As usual, the ultimate test is to try and see what works for you and what doesn’t.