What role does a Domain Name Service perform in a network wh

What role does a Domain Name Service perform in a network?, what is the criticality of ensuring it is well maintained.

Solution

dns is a process for naming computers and network services
roles of dns is
1)support for active directory domain services
2)stub zones
3)integration with other network services
4)support for zone transfer between servers
5)conditional forward

what is the criticality of ensuring it is well maintained.
1)make sure that your email address is correct in the soa
2)make sure of that your not running any recursive name servers
3)ensuring of local host is forward and reverse mapped