An A (IP address) : It is a DNS record that can be used to point your domain name and host names to a static IP address. You can use a A record whenever you have to assign a specific IP to a domain name or to a sub-domain.
A MX (Mail Exchange) : It is a type of resource record in the Domain Name System specifying how Internet e-mail should be routed. It point tothe servers that should receive e-mail, and their priority relative to each other.
A CNAME (Canonical Name) : It allows you to have as many subdomains as you wish without having to specify the IP for every record.
