The Domain Name System (DNS) is a hierarchical and decentralized naming system for computers, services, or other resources connected to the Internet or a private network. In other words a DNS server finds an IP address (example: 188.8.131.52) associated with a domain (example: https://google.com/).
Your Internet Service Provider supplies a DNS but they can be slow therefore finding a website take longer or not load at all. Public DNS servers may offer faster and may provide content filtering.
Some public DNS servers are:
- Google Public DNS, 184.108.40.206 and 220.127.116.11
- OpenDNS, 18.104.22.168 and 22.214.171.124
- Cloudflare, 126.96.36.199
How to configure DNS servers on a computer.