DNS (Domain Name System) is a name resolution system that allows hosts on the Internet to be identified by domain names. The DNS system provides a convenient method of mapping IP addresses known to the network to domain names used by users. When a computer or other device on a computer network attempts to connect to another computer, the DNS system allows the domain name to be mapped to an IP address.

DNS is needed on the Internet because IP addresses are difficult for people to remember and understand, while domain names are much easier to remember. DNS allows a domain name to be assigned to an IP address so that users can browse the web conveniently. For example, if you want to visit a website called www.example.com, you need to split the address into components to get the IP address of the host. The DNS system allows this splitting to take place so that the user does not have to type in the IP address.

DNS is also used to store information about the host name that is used to send and receive e-mail messages. DNS also allows hosts on a computer network to search for other hosts on the Internet. For example, if you want to connect to another computer on the Internet, you need to know its IP address. The DNS system makes this easy because you can type in the host name and the DNS system automatically maps it to an IP address.

The DNS system is managed by a network of DNS servers, which is divided into several zones. The DNS servers are responsible for storing information about domains and IP addresses. Each zone is managed by a specific service provider, which makes the information available to other servers on the network.

DNS is an important component of computer networks because it allows users to easily map a domain name to a host IP address. DNS also makes it easier to send and receive emails and to search for other hosts on the Internet.

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