Examples Domains

Once in articles, you need to specify any domain name, just for example.
Specifically for this are reserved 3 domains:

example.com
example.org
example.net

These domain names can not be purchased, they are not available for registration.

If you go to them, it will say:

You have reached this web page by typing "example.com", "example.net", 
or "example.org" into your web browser.

These domain names are reserved for use in documentation and are not 
available for registration. See RFC 2606, Section 3.