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The Domain Name System (DNS) is a hierarchical naming system for computers, phones, and other devices connected to the Internet. It assigns unique numerical IP addresses to devices within the DNS system.

This allows devices to communicate with each other by referring to their IP address, rather than their hostname.

The DNS system is used to resolve hostnames (such as www.google.com) into IP addresses.

When a user types a hostname into a web browser, the browser sends a request to the DNS server for the IP address for that hostname. The DNS server then looks up the IP address in its database and sends the reply back to the browser.

The DNS system is also used to map domain names (such as google.com) to the IP addresses of the computers that are hosting them.

When a user types in a domain name, the browser sends a request to the DNS server for the IP address for that domain. The DNS server then looks up the IP address in its database and returns the response back to the browser.