Custom DNS, commonly referred to as self-managed DNS is when you are already managing your own DNS records outside
of the scope of HonestHosting using a third-party DNS management system. This can be useful if you already have a lot of
DNS records that you are managing for a particular domain and do not want to deal with migrating DNS to HonestHosting
before you can setup Production-ready Sites.
The downside of this approach is that you must do extra steps to ensure configuration records (DNS, Certificate) are setup correctly for sites.
For more information, review the Site chapter in the docs.