There are five types of available DNS records:

A = Address - This record is used to translate host names to IP addresses.

CNAME = Canonical Name - Used to create additional host names, or aliases, for hosts in a domain.

NS = Name Server - Defines an association between a given domain name and the name servers that store information for that domain. One domain can be associated with any number of name servers.

MX = Mail Exchange - Defines the location of where mail should be delivered for the domain.

PTR = Pointer - Defines the IP address and host name of individual hosts in the domain. Translates IP addresses into host names.