A subdomain is an address that belongs to and is created under a main domain. It allows you to organize different sections, services, or websites under a single domain name.
For example:
yourdomain.com
is the main domain, while:
blog.yourdomain.com
shop.yourdomain.com
help.yourdomain.comare subdomains.
Table of Contents
Domain vs. Subdomain
Domain
A domain is the primary internet address of your website.
Example:
yourdomain.comThis is the address that users type into their browser to access your website.
Subdomain
A subdomain is an additional address created under the main domain.
Example:
blog.yourdomain.comIn this example:
yourdomain.comis the domain.blogis the subdomain.
The subdomain appears to the left of the main domain and is separated by a dot. Even the commonly used www prefix is technically a subdomain. For example, www.yourdomain.com is a subdomain of yourdomain.com.
Why Use Subdomains?
Subdomains are commonly used to separate different sections of a project while keeping them associated with the same main domain.
Examples include:
| Purpose | Example |
|---|---|
| Blog | blog.yourdomain.com |
| Online Store | shop.yourdomain.com |
| Knowledge Base | help.yourdomain.com |
| Client Portal | client.yourdomain.com |
| Development Environment | dev.yourdomain.com |
Each subdomain can host a completely separate website, application, or service.
Advantages of Subdomains
- Organize different services under one brand.
- Run separate applications independently.
- Use different CMS platforms for different sections.
- Create development or testing environments.
- Maintain separate file structures and configurations.
Do I Need to Register a Subdomain?
No.
Unlike a domain, a subdomain does not need to be purchased separately. Once you own a domain, you can create as many subdomains as your hosting service allows.
Examples
Main Website
yourdomain.comCompany Blog
blog.yourdomain.comOnline Store
shop.yourdomain.comCustomer Support Portal
support.yourdomain.comAll of these addresses belong to the same domain but can operate as separate websites or services.
Summary
A domain is your primary website address, while a subdomain is an additional address created under that domain. Subdomains are useful for organizing different parts of a website, running separate applications, or creating dedicated sections such as blogs, stores, help centers, or development environments. They are created within an existing domain and do not require separate registration.