BIND (Berkeley Internet Name Domain) is an implementation of the DNS (Domain Name System) protocols. BIND includes a DNS server (named), which resolves host names to IP addresses; a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating properly.

BIND SDB (Simplified Database Backend) provides named_sdb, the DNS name server compiled to include support for using alternative Zone Databases stored in an LDAP server (ldapdb), a postgreSQL database (pgsqldb), or in the filesystem (dirdb), in addition to the standard in-memory RBT (Red Black Tree) zone database.