What does DNS over HTTPS mean?
DNS over HTTPS, or DoH, carries DNS queries over an HTTPS connection to a compatible resolver. It protects that query path but is not a VPN and does not encrypt every application request. Its scope depends on the client and configuration.
Why it matters
A browser's secure-DNS option may apply only to that browser. Other apps can use operating-system settings or their own resolver. On managed networks, encrypted DNS can conflict with intended internal naming or policy, so consult the administrator rather than bypassing controls. For home testing, use a documented service and preserve the original configuration. DoH cannot add bandwidth or a missing video decoder.
A practical example
A television app may behave unchanged after a laptop browser's DoH setting is enabled. The setting did not necessarily apply to the television or even to other software on the laptop.
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Related terminology: DNS cache, DNS over TLS.
For practical setup and troubleshooting, browse the journal or support guides.