Dear Android security members

I have got several questions about authentication certificate.

First question.

i guess that there are several authentication cerificates such as
server certificate, client certificate and user certificate on android
OS.

Is that right ??


If it is right, could you expain that what difference is between?  i
mean in aspect of concept.


Second question

also i'm not sure it is right that there are OS free installed and Add
in in CA.

if it is right, please expain me.


Third question

if the above facts are right , how  it is applied to mail, browser,
wireless LAN  and VPN on android OS?


if  there is something you don't understand, pleas ask me again.

or if this questions are not suitable to this place, please let me
know where i should ask.


Thank you so much  for reading and i will really appeciate it if you
reply as soon as possible.



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