Domain Name System (DNS) has been around for the better part of the last 35 years. Its basic premise of translating memorized domain names to IP addresses didn’t really change. However, its unencrypted nature might lead to DNS hijackings or privacy violations. You can check from here if you’re using an encrypted DNS.
Fortunately, two different propositions, namely DNS over HTTPs and DNS over TLS emerged in this area to combat these shortcomings. Different public resolvers and clients started to support these standarts in the last few years. If we look at the more commonly used softwares, Android 9 and Firefox added support for this a few years ago and Google Chrome is currently experimenting. On iOS side, you can use 18.104.22.168 app by Cloudflare and probably many others.
With widespread support available now and coming soon, there is literally no reason not to try and improve your privacy.