What is sub Domain..?

A subdomain is basically a child domain under a larger parent domain name. In the larger scheme of the Domain Name System, it is considered a third-level domain used to organize site content. In the Web address example above (gallery.mysite.com), the suffix ".com" is the first-level domain, "mysite" is the second-level domain and "gallery" is the third-level domain.

Uses of subdomains include:

- Organizing website content according to category, i.e., gallery.mysite.com, faq.mysite.com and store.mysite.com
- Sharing the allotted domain space with other users by providing them subdomains and their own username and password with varying levels of feature access. For example, admin.mysite.com, user1.mysite.com and guest.mysite.com
- Shortening long links and making them easy to remember. For example, the link "http://mysite.com/offers/bonus/referal_id^56$#9?.asp" can be placed into the subdomain "referral.mysite.com" to make it easier to navigate and remember.

This video and the information below it explain what subdomains are and how they are used to forward to URLs or point to IP addresses and directories within your hosting account.

It’s easy to create a memorable Web address for unique content areas of your site by using subdomains. For example, you could create a subdomain for pictures on your site called "pics" that is accessible through the URL pics.coolexample.com in addition to www.coolexample.com/pics.

You can add up to 100 subdomains per domain name. You can also add multiple levels of subdomains. For instance, you can add info.blog.coolexample.com to delve into an even more specific area of interest on your site. Each subdomain can be up to 25 characters long.

A subdomain is a domain that is a part of a larger domain under the Domain Name System (DNS) hierarchy. It is used as an easy way to create a more memorable Web address for specific or unique content with a website. For example, it could make it easier for users to remember and navigate to the picture gallery of a site by placing it in the address gallery.mysite.com, as opposed to mysite.com/media/gallery. In this case, the subdomain is gallery.mysite, whereas the main domain is mysite.com.

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Subdomain names are Web addresses created by adding a third-level domain to your existing domain name. For example, janesbagels.com might have the subdomains shop.janesbagels.com or blog.janesbagels.com.

Thanks for the info

In simple, the subdomain means the subcategory. Subcategory means a part of something (the main category) same with the subdomain.

Subdomain can be build by adding prefix OR suffix in your domain name.

A subdomain is an additional part to your main domain name. Subdomains are created to organize and navigate to different sections of your website. You can create multiple subdomains or child domains on your main domain.

Subdomains are the third level domains that are used to organize your web site content. They are just like folders under your root directory. But they will have a special URL to access.

A subdomain is a subset or a smaller part of the main domain. For example, hostsearch.com is main domain and forums.hostsearch.com is the subdomain.

Domains are organized into a simple tree structure or hierarchy called the domain name system (DNS). The DNS starts with top-level domains (TLD) like .com or .org, which is sorted into domains and subdomains.

A subdomain is a part of a larger domain; the only domain that is not also a subdomain is the root domain. It's very simple to create a memorable Web address for unique content areas of your web site by using the subdomains.

A subdomain is a domain that is part of a larger domain; the only domain that is not also a subdomain is the root domain.
For example, west.example.com and east.example.com/ are subdomains of the example.com domain, which in turn is a subdomain of the com top-level domain (TLD).

This is a subcategory of the domain for an example subdomain will be our website .com there are just like folders under your root directory but they will have a special URL to access. subdomains are indicated by the section to the root URL.