the "zone" description listed was pretty good.
Basically, the leftmost name in a fully qualified domain name is the "host" (which could really be an alias or something) and the rest is the domain name. So for example
u17.us.mail.somecompany.com
u17 is the "host" (in this fictional account, a departmental mail server in the US division of somecompany)
us.mail.somecompany.com is the "domain"
The names get more general from left to right. It is a hierarchy.
Similar to a postal address.
For example
John Doe 17 Main Street Anytown, TX 75263 USA
John Doe is the "host"
17 is a specific location on a general street "Main Street" which is found in Anytown which is found in TX which is found in the USA. As a domain name it might be written
JohnDoe.17.MainStreet.75263.Anytown.TX.USA
Alfons Mueller Schardthof 10 D-84051 Essenbach Germany
would be the same.
AlfonsMueller.10.Schardthof.84051.Essenbach.Bayern.Germany
is a progressively more general description of where Mr. Alfons Mueller can be located.
When you send a postal letter to one of these people (John Doe or Alfons Mueller), the letter is sent to the respective country's main postal "office", then to a regional and then a city and then maybe a neighborhood (depending on your area) post office before being delivered. The hierarchy helps the routing of the mail.
Same with domain names. The hierarchy helps to keep trach of the complexity in a delegated fashion
Sorry for the complex examples Chad
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