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An SLD (Second Level Domain) is a domain that is hierarchically directly below a TLD.
It is usully used as a way to differenciate various functions of a server or to delimit areas under the same domain. For example, www is a commonly used SLD to indicate the domain points to a web server.
As another example, in developer.mozilla.org, the developer SLD is used to specify that the subdomain contains the developer section of the mozilla website.
Learn more
- SLD on Wikipedia