What’s the Difference Between a Subdomain and a Sub-directory?

When setting up or managing a website, you may hear the terms subdomain and sub-directory. Both are ways of organising content under a main website address, but they work differently and are used for different purposes.

What Is a Subdomain?

A subdomain is a separate section of a website that sits before the main domain name.

Example

If your main website is:

example.com

A subdomain would look like:

exhibitors.example.com
blog.example.com
login.example.com

Key characteristics of a subdomain:

• Treated as a separate site by browsers and search engines

• Can have its own design, content, and functionality

• Often used for distinct areas such as:

  • Exhibitor zones

  • Login portals

  • Blogs

  • Support or help centres

Think of a subdomain as a separate building on the same property.

What Is a Sub-directory?

A sub-directory is a folder or section that sits after the main domain name.

Example

Using the same main website:

example.com

A sub-directory would look like:

example.com/exhibitors
example.com/blog
example.com/login

Key characteristics of a sub-directory:

• Part of the same website as the main domain

• Shares the same branding, structure, and SEO authority

• Easier to manage as part of a single site

• Commonly used for:

  • Content pages

  • Event sections

  • Blog posts

  • Resource libraries

Think of a sub-directory as a room inside the same building.

Subdomain vs Sub-directory: Quick Comparison

Which One Should You Use?

The right choice depends on what you’re trying to achieve:

Use a subdomain if:

• The section needs to function independently

• You want different login systems or permissions

• The content serves a distinct audience (e.g. exhibitors only)

Use a sub-directory if:

• The content is closely related to the main site

• You want to benefit from shared SEO value

• Consistent branding and navigation are important

How This Applies to ASP Websites

ASP websites can use both subdomains and sub-directories, depending on the structure and requirements of your event.

For example:

• An Exhibitor Zone may be hosted on a subdomain

• Event content pages may live in sub-directories

The approach is chosen based on usability, security, and performance best practices.

If you’re unsure which option is best for your site, please contact our support or account team, and we’ll be happy to advise.

Summary

• A subdomain is a separate section of a site with its own identity

• A sub-directory is part of the main website structure

• Subdomains are best for independent areas

• Sub-directories are best for related content

• ASP will recommend the best setup based on your needs

Both options are common and valid — the key is choosing the one that best supports your site’s goals and user experience.