The DNS converts human-understandable domain names to computer-understandable IP addresses. On your system, you use the DNS server, which is set by default by your internet service provider (ISP).

Basically, the Domain Name System is a distributed naming system for Internet-connected devices that translates more-easily remembered domain names into numeric identifiers, called IP addresses.

The ISP-provided DNS servers usually come with privacy concerns and do not offer optimal performance. Here's how to change DNS server across different devices.