Subdomains have many names, they can be called: subdomains, parallel parked domains, etc. The essence of the meaning of each term is a little different from each other and should not be treated all the above names under one common value. In this article we try to explain the essence of each individual title.

What is a subdomain

Subdomain – this is essentially the same domain as your primary domain name, with the only difference. Subdomain is actually a sub-domains on your main domain, it is always a level below the main domain name.

If your primary domain name example.com, then the subdomain of the name can be blog.mysite.com. If you recall an article about the levels of domain names, it can be assumed that blog.example.com – it is a separate third level domain. But in practice, it still is a subdomain of the main domain example.com, while ranked by the search engines as a separate domain. The reasons for the creation of additional domains hosting may be several.

Firstly, it is the desire of the owner of the site to organize your life according to the laws of structuring. Second, to facilitate the process of moving the resource online. Both are equally a very important argument in a proper and quality work online project.

Next, consider the options for creating subdomains:

Multilingual website. If the site owner decided to create a website in several languages at once, without subdomains can not do. Creating an additional domain for each language would look like this: eng.example.com and so on.
Large complex projects. If the plans webmasters include the creation of a large site with many structural sections subdomains here will be very useful. For example, forum.example.com or photos.example.com

And as mentioned above, the creation of subdomains has very positive effect on SEO. Sites with a properly organized structure are very good at promoting. Subdomains of one site can be promoted both separately and establish priorities subdomains.