A subdomain is a prefix added to your main domain name, creating a separate section of your website. It appears before the main domain in the address, like blog.yourwebsite.com or store.yourwebsite.com. Think of it as a branch of your primary website that can have its own unique content and functionality.

Subdomains are commonly used to:

• Organize content – Separate a blog, forum, or support section from the main site.
• Create regional sites – Such as us.yourwebsite.com for the United States.
• Test new features – Use a subdomain like dev.yourwebsite.com for development and testing.
• Host applications – Run webmail, client portals, or e-commerce stores.

To set up a subdomain, you typically:

1. Access your hosting control panel (like cPanel).
2. Navigate to the "Subdomains" section.
3. Enter your desired prefix (e.g., "blog") and select the root domain.
4. Point it to a specific directory on your server.

Subdomains are treated as separate entities by search engines, which can help with SEO for specific topics. They are included in most hosting plans and are easy to manage. Using subdomains effectively can improve your site's structure, user experience, and organizational efficiency.