There are several domains dedicated for example and special purposes. This is just one. https://www.iana.org/assignments/special-use-domain-names/special-use-

There are several domains dedicated for example and special purposes. This is just one. https://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml https://www.iana.org/assignments/special-use-domain-names/sp... https://www.iana.org/domains/reserved https://www.iana.org/domains/reserved