DNS and Mirror

I am no expert at the technical aspects of DNS and web hosting.
I understand that we require at least two DNS entries per domain name.

Could I thus assume that to achieve close to the 100% uptime, I can have my same (site) hosted on two servers ? And using the Primary DNS pointing to the DNS of the first host and the Secondary to the second.

Does it work in that when the first server cannot be down cos of say connection outrage or something that the user would be redirected to the DNS of the 2nd host ? Thus providing a higher uptime ?

Thanks.

Edwin

 

 

 

 

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