The acronym for Domain Name System is DNS. DNS is a directory service that maps a host’s name to its numerical address on a network. DNS is necessary for the internet to function.
A domain name is a sequence of symbols specified by dots that are assigned to each node in a tree. The Domain Name System (DNS) is a service that converts domain names into IP addresses. This allows network users to search for other hosts using user-friendly names rather than knowing IP addresses.
Working of DNS
- DNS is a network communication mechanism for clients and servers. DNS clients make requests to DNS servers, and DNS servers respond to the queries.
- Forward DNS lookups are queries that contain a name that is turned into an IP address, whereas reverse DNS lookups are requests that contain an IP address that is transformed into a name.
- DNS uses a distributed database to keep track of the names of all the hosts on the internet.
- A piece of software such as DNS resolver sends a request to the DNS server to acquire the IP address of a hostname when a client such as a web browser submits a request containing a hostname. If a DNS server does not have the IP address for a hostname, the request is sent to another DNS server. If the resolver receives an IP address, it completes the request over the internet protocol.
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Study in detail about DNS at https://www.cloudflare.com/en-in/learning/dns/what-is-dns/