Pros and cons of having 2 "different" nameservers?

I know some people have done this. But I never try this, so I need some advice.

Register 2 different nameservers for one site (nameserver IPs of course are different, but you know what I mean, the 2 that do not resolve to the same server), so that when either server goes down it won't affect the accessibility of the site.

But what are the pros and cons of doing this?

 

 

 

 

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