Can anyone tell me....

[Redstar7]

Why does my ISP give me a Primary DNS and a Secondary DNS?

 

[SpeedTester]

If one was down you could still connect to the secondary one. My Primary is in Boston and My secondary is in New york.

Quick explaination of DNS
The Domain Name System (DNS) is a distributed Internet directory service. DNS is used mostly to translate between domain names and IP addresses, and to control Internet email delivery. Most Internet services rely on DNS to work, and if DNS fails, web sites cannot be located and email delivery stalls.