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The server process that performs domain name lookup within an ISP and therefore implements DNS is known as bind. The principle jobs that bind does are

1. act as the authoritative naming service for a domain and
2. link with other domain name servers to process iterative or recursive name look-ups with other domain name servers, including the back-bone name servers.

There are usually at least two servers in a domain that run the bind daemon. One typically acts as a master and the other a slave with the idea if one should fail, the other can continue to provide DNS services both within a domain and to the wider Internet.

Note: Bind is so named because it binds a domain name to an IP address (or vice versa) rather than because it is a daemon that implements the bin protocol (see also HTTP and httpd).

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