Let's get started professionally,
"Domain Name System" is what "DNS" stands for. It is a mechanism that gives you the ability to connect to websites by associating human-readable domain names with a unique ID of the server on which a website is kept.
And a little more understandable...
At its most basic, DNS is a list of names and numbers that go together. In this case, the numbers are IP addresses. Computers use IP addresses to talk to each other. Imagine the DNS system as the phone directory for the internet. Instead of listing names and phone numbers for individuals, it lists domain names together with the matching identifiers known as IP addresses. A user's device looks up the IP address and links them to the location where the website is physically kept when they type a domain name into it.
So let's start with NS1 and NS2
Whenever you register a domain during the registration process, you are asked which Name Servers you want
NS1, NS2, NS3 etc
And then you type something like;
Or if you are hosting with us, it is already set automatically.
Which means that the browser will find all other DNS records at the NS1 or NS2 address if the first one is not available for some reason
It looks something like this to you
After that, when the dns records are activated and working, which can take up to 24 hours, but is usually faster
NS tells the browser at which address it will find all other information about that domain
Where is the mail server, web server, mysql server, etc.
You can always check how your DNS records are set on the LEAF DNS page in a few seconds