DNS full form is "Domain Name System", it is nothing but an alias of IP Address, as IP Address is not human readable, that's why we have DNS names.
We used to enter DNS names instead of actual IP Address of any website, as it is easily to remember.
So DNS names will be resolved to an IP address.
The Domain Name System (DNS) is the phone book of the internet.
It's a hierarchical and distributed naming system that translates human-readable domain names
(like "google.com") into machine-readable IP addresses (like "172.217.160.138").
This is because computers communicate with each other using IP addresses, but it's much easier for us humans
to remember names than numbers.
There are 4 Different DNS Server types used while loading any Website.
1) DNS recursor
2) Root Nameserver
3) TLD Server (TLD is Top level Domain)
4) Authoritative Nameserver
Full DNS records consist of following details :
1) A record (Nothing but an IP address)
2) TXT record (Descriptive Text, used to hold general information about a domain name, also used in verifying domain in Google SEO Tools)
3) LOC record (Geographical location details about hosts, networks, and subnets.)
4) SOA record (Full form of SOA record is a Start of Authority, from where the domain is origin, i.e. Parent Domain name record)
5) NS record (aka Name Server record, it used to delegates a subdomain to a set of name servers. )
6) SRV record ( aka Service Discovery, it tells type of TCP used)
7) SPF record (SPF record fullform is Sender Policy Framework record.)
8) CNAME record (Canonical, pointing to Canonical Domain name, not to an IP address)
9) MX record (Mail Exchange information)
10) AAAA record (IPv6 address for a host)
These records are crucial for various online services, including:
Websites: A records and CNAME records direct web browsers to the correct servers to access websites.
Email:
MX records ensure emails are delivered to the right mail servers.
Security: SPF and DKIM records help protect against email spoofing and phishing attacks.
Other services: SRV records can be used to specify the location of services like instant messaging or VoIP.
Here are some additional facts about DNS:
DNS was invented in the early 1980s.
There are millions of DNS servers around the world.
DNS is a hierarchical system, with top-level domains (like ".com" and ".org") at the top, followed by second-level domains (like "google" and "amazon"), and so on.
DNS records can store a variety of information about a domain name, such as its IP address, its email server, and its web server.