the.com/namespace
the polite fence that stops your 'user' from brawling with everyone else's 'user'.
means a named container that scopes identifiers so the same name can mean different things in different contexts without collision.
from from mathematics' notion of naming domains, formalized in computing by languages like C++ (1995 keyword namespace) and XML, solving the ancient problem of two libraries both wanting to call something 'list'.
python's mantranamespaces are one honored way to honor code
dns connectiondomain names are namespaces for the internet
c++ originadded specifically to end library naming wars