TheSecond Level Domain (SLD) is the part of the domain name that is located right before aTop Level Domain (TLD).

For example, inmozilla.org the SLD ismozilla and the TLD isorg.

A domain name is not limited to a TLD and SLD. Additional subdomains can be created to provide additional information about various server functions or to delimit areas under the same domain. For example,www is a commonly used subdomain to indicate that the domain points to a web server.

As another example, indeveloper.mozilla.org, thedeveloper subdomain is used to specify that the subdomain contains the developer section of the Mozilla website.

See also

• SLD (Wikipedia)
• Related glossary terms:
  • DNS
  • Domain
  • Domain name
  • TLD