What is the difference between A name c name and MX record in DNS Server?

A record from Name to IP

C record its an alias from name to name

MX record to point to your mail server

Before going further into the details, it’s important to know that A and CNAME records are standard DNS records, whilst ALIAS and URL records are custom DNS records provided by DNSimple’s DNS hosting. Both of them are translated internally into A records to ensure compatibility with the DNS protocol.