A server responsible for keeping mappings of IP Addresses to Domain Name and storing records.
Conventionally seen on port udp/53.
Common DNS Servers
8.8.8.8 - Google DNS
8.8.4.4 - Google DNS
1.1.1.1 - Cloudflare DNS
1.0.0.1 - Cloudflare DNS
9.9.9.9 - Quad9 DNS