A subdomain is a domain that is part of a larger domain. It is used to organize and structure websites in a hierarchical manner, creating distinct sections or branches within the main domain. Subdomains are formed by adding a prefix to the main domain name, creating a unique web address for specific content or services.

Here are key points about subdomains:

1. Structure:
   • Main Domain: The main domain is the primary web address, such as “example.com.”
   • Subdomain: A subdomain is created by adding a prefix to the main domain, such as “blog.example.com.”
2. Example:
   • Main Domain: example.com
   • Subdomain: blog.example.com
   • Another Subdomain: shop.example.com
3. Use Cases:
   • Content Organization: Subdomains are often used to organize content or services into distinct sections. For example, a blog might be hosted on a subdomain like “blog.example.com.”
   • Multi-site Hosting: Subdomains can be used to host multiple websites or web applications on the same domain.
   • Language or Region Specific: Subdomains can be employed to cater to different languages or regions. For instance, “en.example.com” for English content and “fr.example.com” for French content.
4. DNS Configuration:
   • Each subdomain has its own DNS (Domain Name System) records, allowing for independent configuration of settings such as IP addresses and mail servers.
5. Technical Implementation:
   • Subdomains can be set up through the domain registrar or web hosting provider’s control panel.
   • The web server can be configured to handle requests for specific subdomains, directing them to the appropriate directory or web application.
6. Common Subdomains:
   • www: The “www” subdomain is commonly used as the default prefix for websites, as in “www.example.com.”
   • mail: Used for email services, like “mail.example.com.”
   • blog: Often used for blogs, as in “blog.example.com.”
   • shop: Used for e-commerce sites, as in “shop.example.com.”

Subdomains provide a way to organize and structure online content, making it easier for users to navigate and locate specific information or services within a larger website. They are a flexible tool for managing diverse content and services under a single domain name.