DNS(A, NS, MX, CNAME, SPF, )

Your domain name has a DNS zone which consists of the following records:

NS - specifies which are the DNS servers for your domain;
A - specifies IP addresses corresponding to your domain and its subdomains;
MX - specifies where the emails for your domain should be delivered;
CNAME - specifies redirects from your domain's subdomains to other domains / subdomains;
SPF - Sender Policy Framework (SPF) is an attempt to control forged e-mail.