Networking
What Is DNS and Why Does It Matter?
How the Domain Name System turns familiar website names into routable addresses.
The Domain Name System, or DNS, helps applications find services by translating names such as example.com into network addresses. It works like a distributed directory rather than one central phone book.
A typical lookup
Your device asks a resolver for an address. If the answer is not already cached, the resolver follows the DNS hierarchy until it reaches an authoritative source for the domain.
Why caching exists
Caching avoids repeating the full lookup and makes browsing faster. Each record has a time-to-live value that tells resolvers how long an answer may be reused.
Privacy and security layers
Encrypted DNS can protect queries between your device and the resolver. DNSSEC can help verify that signed answers were not altered. Neither feature decides whether the destination website itself is trustworthy.
The bottom line
Changing resolvers can affect privacy, filtering and reliability, but it does not make the whole internet connection anonymous.