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What is a second-level domain (SLD)?

A top-level domain (TLD) is the part of the domain name located to the right of the dot ("."). A second-level domain (SLD) is the part of the domain name that is located to the left of that dot ("."). It may commonly refer to the organization that registered the domain name with a domain registrar. However, sometimes domain registries introduce a second-level to their TLD that indicates the type of organization intended to register an SLD under it. As an example the .UK registry allows for registration of .CO.UK for companies, .ORG.UK for organizations and .ME.UK for individuals.

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