The only thing I know is that
it is
"Berkeley Software Distribution"
Its an UNIX OS (like almost all other OSes)
But I think this is paid software so then they started
FreeBSD project

I don know any other definition

and about me the only person replying
I think u too reply
and I love to get more computer knowledge

and waitin 4 d ans
Coz las time RPG bowled a googly to me