Docs Glossary Subdomain


What Is a Subdomain?

A subdomain name is an extra section at the beginning of a regular domain. For example, we can add a www subdomain to to create

Subdomains can be used to display different versions of your site, or a completely separate site.

When you connect your domain name to SendLayer, you’ll use a subdomain to send emails from your own custom email address. This protects your sender reputation.

How Do Subdomains Work?

Subdomains work by directing visitors to a different part of your site, or a different site entirely. If you already have a domain name, you can add subdomains for many different purposes.

We already mentioned the example of adding a www subdomain to the domain to create That’s the most common example of a subdomain that you’ll notice while browsing the web. Most of the time, the www subdomain points to the main domain.

There are many other reasons to create a subdomain. For example, you might want to have your main website at, but use for your blog. This allows you to run 2 separate sites using 1 domain name.

What Are Subdomains Used For?

Subdomains can be used for a variety of networking purposes. For example, you can:

  • Separate part of your website from the main content, like and
  • Create a completely separate website without buying another domain name
  • Set up multiple versions of your site in different languages
  • Provide a shortcut to something on your server; for example, some web hosts use as a shortcut to your webmail account
  • Send and receive emails.

To connect your domain name to your website, you need to edit the DNS records for your domain. The DNS record is a little like your domain’s entry in a phonebook, so it contains all of the information needed to send your visitors to the right place, depending on the subdomain that they visit.

Why Are Subdomains Used to Send Email?

SendLayer uses a subdomain to send email because it protects your domain’s email sending reputation. For more information, check out why SendLayer sends emails from a subdomain.

That’s it! Now you know how subdomains work.

Would you like to learn how to set up your subdomain in SendLayer? Check out the following resources: