UM_distinctid, what is this cookie?

what is the cookie of UM_distinctid? Always exist locally, neither server set-cookie, client nor setup, inexplicably always exist, technology stack: vue+axios

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Mar.11,2021

COOKIE
CNZZDATA set by Friends is the cookie of CNZZ statistics, while CNZZ statistics is acquired by Friends, so UM_xxx is the cookies of Friends.


now a lot of statistics are collected by UM_xxx,.

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