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Host names exist within Internet domains. Domains provide a hierarchical naming convention to conveniently divide up the world of Internet host names. For example, consider the host name:

purchasing.ebaubles.com

Here:

• purchasing is a host name within the ebaubles.com domain
• ebaubles is a domain within the com domain
• com is the domain for all US commercial sites.

Non-US names tend to append a name to indentify the country. For example:

benefits.porkpiesareus.co.uk

Note: For some reason that I haven't figured out yet, non-US commercial companies appear to use the co domain, rather than com.)