A domain name is a dot `.` separated identifier that identifies ownership from the right to the left.
A way to read a domain name like `company.co.uk` is “name `company` is registered to the `co` domain that itself is registered to the `uk` domain”.
It’s up to `company` to decide which domain it wants to be registered under.
FYI, ownership might not be the best term, but it is close enough.
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