Unbound is a free, open-source, recursive, and validating DNS caching server. It uses DNS-over-TLS and DNS-over-HTTPS to encrypt connections between clients. Compared to Bind9, Unbound is lightweight and extremely fast. A caching server will help you to reduce the loading time of the website by keeping the cache database on an Unbound server. It is also capable of DNSSEC validation and can serve as a trust anchor.