The term Money Laundering has American origin as far as I know. Laundry is such a business which is entirely cash driven. There is no question of debots.

Few people used to open laundry without actually opening it. They used to show their black money as income from business. That was very convenient way of converting black money into white money.

The term money laundering means converting black money into white money. The ways of money laundering is to open Benami (fake) bank accounts and deposit cash there and then get it transferred in your legitimate bank account.

Or opening Benami demat account, purchasing shares and transferring them in your legitimate demat account etc.