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The internet address book that maps domain names to server addresses.
DNS tells browsers where to find a site like boostor.ai. Misconfigured DNS can make a working app look offline.
Plainly
Think of DNS as roads and power for the app city. The internet address book that maps domain names to server addresses.
In practice
Use it when local behavior needs to become a reachable, reliable deployed service. In practice, define the owner, input, output, and failure mode before you rely on it.