: According to an article from 2011 on the google webmaster blog, subdomains are considered to be internal links for a website: http://googlewebmastercentral.blogspot.fr/2011/08/reorganizing-internal-vs-external.html

@Pierce454

According to an article from 2011 on the google webmaster blog, subdomains are considered to be internal links for a website:
googlewebmastercentral.blogspot.fr/2011/08/reorganizing-internal-vs-external.html
I know it is possible to create a different entry in google webmaster tools for multiple subdomains but it does not mean they are counted as different websites.

In fact, Matt cutts mentioned in a video, that they saw webmasters abusing subdomains in order to get more results on one page. By the past Google considered subdomains to be different domains but it is not the case anymore.

Then, Matt cutts also said that subfolders and subdirectories are similar.

Link to Matt Cutts videos about Subdomains Vs Subdirectories:

if you consider https, you will need one wildcard SSL certificate to protect all your websites with a different subdomain. Usually it is 10 times more expensive than a SSL certificate to protect one (www and non www) domain.

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