The Domain Name System (DNS) routes web traffic and emails for a domain to the server responsible for hosting the content. This allows your visitors to be able to load content or send emails without having to memorize IP addresses or any technical details.
Enabling Custom DNS will change the nameservers on your domain to point to Cloudflare and will take down any previous website or email server.
Sav's DNS is powered by Cloudflare. They provide free additional services such as SSL, CDN, DDoS Protection when traffic is routed through their Web Proxy. The Web Proxy is a server that sits before a domain's web server that applies SSL and filters traffic before reaching your server directly. This can be enabled or disabled by the Proxy dropdown when adding or editing a DNS record on Sav. Learn more about Cloudflare's DNS services here.
Please allow up to 48 hours for DNS changes to take effect.