Domain Name System, or DNS, is a complex system to understand, but cPanel has simplified the administration of DNS by adding it to the WHM interface. One of the most common tasks involved with administrating DNS is updating an A record. A records are one of the most common DNS entries, and cPanel makes updating them easy.
This article assumes that you are running BIND on a Linux server, that you already have an understanding of what DNS is, the different types of DNS entries, and how DNS works. Please note: The incorrect editing of your zone file can take your site offline. All editing must be done on the authoritative nameservers for the given domain.