What is the use of 2 name servers ?

Hello,

If a domain have 2 name servers registered into it's DNS :
say primary ns will resolve to the server located in A location while secondary ns resolve to the server located at B geographical location.

When server in location A down, will the site of that domain be still alive or down too ?

Appreciate if someone can answer it.
Thank you.

 

 

 

 

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