About BIND9

BIND is the most widely used DNS system on the internet, on Unix like operating systems its the de facto standard. Originally written by four graduate students at the Computer Systems Research Group at the University of California, Berkeley (UCB), the name originates as an acronym from Berkeley Internet Name Domain, reflecting the application’s use within UCB. BIND 9 was released in September 2000.

Raspbian is an unofficial port of Debian wheezy armhf with compilation settings adjusted to produce code that uses “hardware floating point”, the “hard float” ABI and will run on the Raspberry Pi.

Full article here:
How To Install & Configure BIND9 on Raspbian Wheezy (Sam Culley)