Bitcoin Name Service (BNS) Explained: A Guide to .BTC Domains
Briefly

BNS is the Web3 phonebook and provides a mapping between human-readable host names such as unchained.btc to cumbersome alphanumerical wallet addresses.
Where DNS depends on centralized servers, BNS runs on peer-to-peer server systems that are secure and censorship-resistant.
Read at Coindesk
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