An MX record or Mail exchanger record is a type of resource record in the Domain Name System (DNS) specifying how Internet e-mail should be routed. MX records point to the servers to send an e-mail to, and which ones it should be sent to first, by priority.
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NS Record
Name Server Record. An NS record declares that a given zone is served by a given name server. Every NS record is either a delegation record or an authority Record. If the name of the NS record is the name of the zone it appears in, it is an authority record. If the name of the NS record is that of a descendant zone, then it is delegation record.
Nslookup -type=ns www.example.com
SOA Record
The first resource record in any Domain Name System (DNS) Zone file should be a Start of Authority (SOA) resource record. The SOA resource record indicates that this DNS name server is the best source of information for the data within this DNS domain.
Nslookup -type=soa www.example.com
A Record
An A (address) record is a DNS record that can be used to point your domain name and host names to a static IP address.
An A-record is an entry in your DNS zone file that maps each domain name (e.g. yourdomain.com) or subdomain(e.g. subdomain.yourdomain.com) to an IP address. In other words, the A-record specifies the IP address to which the user would be sent for each domain or subdomain. This means that you can have different subdomains of your website resolving to different IP addresses, which could be useful if they are hosted on different servers.
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