When you enroll a domain name, most hosting/domain providers offer you free sub domains. Some (like Bluehost) actually proved unlimited sub domains, but all hosting providers provide enough sub domains for normal use. But exactly what is a sub-domain name and what is it used for? Any Domain name can be subdivided into smaller units called Sub domains. Because subdomains are part of the primary website name they don’t have to be registered. To be able to really understand why concept you need to understand precisely what a website name is.
Non-geographic domains like.Com; which is the most frequent, have 2 levels with each level separated by a dot (.). Notice that there is absolutely no www proceeding the website name as www is in reality a hostname. Now once you sign-up a website name, you are free to divide that domain name further into subdomains by creating a third level.
The titles for the subdomains are decided by you, nor need approval of any Internet government bodies. Note: This is the main difference between a sub-website and a domain. Most people hand out the address of the website you start with www. In the event that you type this address into a web browser then you will reach the ibm website.
Why will be the Used? Subdomains allow you to divide your website name/website into areas or different areas. As an analogy, if you go to any medium to large company office you will notice it divided into various departments like accounts, sales, product development. People who work in these various departments are all located close to each other maybe on the same floor or office section. You can certainly do the same with your website.
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If you have a medium/large company you may want to have a separate website for the sales, and another for the Marketing part. Rather then having totally independent websites you can section or separate your primary website in the same way you would a normal office. Nevertheless, you don’t need to make a subdomain to do this actually. Now all we need to do is to associate the sub-domain names with their little bit of web space.
Again this is only a trusted convention. The treatment of subdomains by he’s has changed as time passes. At one time a subdomain was treated as a total distinct site by the search engines leading to sub website spam. However this has transformed and they acknowledge the hyperlink between a parent and subdomain domain name. From a Search and management Engine perspective using folders is recommended over subdomains. I only use subdomains for test websites normally. Q1- Do I need to pay extra for a subdomain? A1- No not usually. However hosting providers may limit the number of subdomains that you can create.