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What is a second-level domain (SLD)?
The second-level domain is the readable part of the domain name that is located immediately to the left of the dot. For example, the second-level domain in coolexample.com is “coolexample.” You define the second-level domain when you register most domains. However, there are some registries that restrict the second-level domain, such as .UK domains. Domains with this extension must include .CO. For example, coolexample.co.uk.
