Animax is a channel from Sony Co., they first started in Japan, where they air DBZ and GT.
Animax in India is the same, exept some prgrams here and there sifted. But Animax may soon realise the craze of DBZ and should put it on in India as well.
Official Site ? dragonballz.com, what else lol.
And the short background on DBZ - Like Superman, Goku is an alien race, he was sent to earth do 'destroy it when he grows up', he was a saiyan, and saiyans are 'planet busters' by their sheer power. At one time, Vegeta's father King Vegeta destroyed 3 planets together at the wave of his arm - that powerful.
But, baby goku hit his head hard and forgot the mission to destroy earth, he was raised up, trained hard, and went on to protect earth from various villains to came to earth in search of dragonballs, which are 7 in number, and when collected together they summon a powerful dragon called the eternal dragon, and he can grant any wish, at one time he even brought back the earth upon wishing after kid Buu blasted earth into pieces in the buu saga.
DB - Comedic, story about goku growing (this never aired in india)
DBZ - Less comedic, more gory and violent (Aired in Toonami till arnd 50 eps)
DB GT - This series is hated by DB fans for some reason, but its like DBZ more or less but a little poorly done on plot. (this too never aired in india)