DNS
Record Types
Complete list is on wikipedia, these are common ones:
A
A is short for ‘address.’ and its the most popular record type. It connects your website domain name (e.g. example.com) or subdomain name (e.g.blog.example.com) to a numerical IPV4 address such as 127.0.0.1. Think of this as the home address of your website.
When a user looks up your website, an ‘A’ record points traffic from example.com (indicated by @) to the IPv4 address.
AAAA
Same as an A record but points the domain to an IPv6 address. The difference between IPv4 and IPv6 is the length of the IP address name from 32 bit to 128 bit consecutively. Because many domains use domain registrars, their nameservers have an IPv4 address, so an AAAA record is not present.
ALIAS (Auto resolved alias)
CNAME (Canonical name for an alias)
Stands for “Canonical Name”
Think of the A record as the one sitting at the top of the naming tree. When you want to add applications, a typical example of their requirements is to link www.example.com to your domain. So the CNAME record makes sure www.example.com knows example.com (the A record name)is the true (or ‘naked’) domain.