Money earned by illegal sources are Black Money.
India is on the Top country from whole our the world, who had uncountable Black Money.
The amount of Black money has been deposit in the foreign countries by unknown sources and names. India have uncountable families who are not suitable for himself because their has some families containing black money and trying to make context with foreign banks to deposit their money and wait till the Governments of India forget about their Budget files.
Here biggest issues is that foreign banks allowing to deposit their money in his bank without knowing that the money is black with is very dangerous for both.