There have been reports that White Tigers were seen in nature. These occurrences were rare.
White tigers are bred. They are a blend of the Siberian and Bengal Tigers. There is a white gene that comes into play.
The reason these tigers are bred is to attract visitors wherever they are able to be seen. These tigers are in captivity.
The pictures, except for one, are from Wikipedia Commons.
At the Mysore Zoo, by Vinyak Kulkami, Bangalore.