DNS (Domain Name System) servers provide an online mapping between human-readable domain names, such as, and numerical IP addresses.

DNS servers translate domain names into IP addresses before forwarding requests to the appropriate server. This process allows users to access websites and other resources by simply entering the domain name rather than the corresponding IP address.

DNS servers are essential for the functioning of the internet. Without DNS, users would need to remember the corresponding IP address for every website they wished to visit.

This process would become cumbersome and time-consuming especially for users with numerous websites to access.

DNS servers are also used to resolve hostnames to IP addresses for Network Address Translation (NAT) devices. NAT allows multiple devices on a network to share a single IP address. For example, a computer on the network may have an IP address of but may want to access the website from another device on the network, such as a phone. NAT assigns a different IP address to each device on the network, such as 192.

1.101 for the computer and 192.102 for the phone. When the computer requests, the DNS server resolves the hostname to the appropriate IP address.