Kalyan Matka is a form of gambling or lottery that originated in India. It was started by Kalyanji Bhagat in the 1960s and further developed by Ratan Khatri in the 1970s. Originally, it involved betting on the opening and closing rates of cotton traded on the New York Cotton Exchange. However, over time, it evolved into a more generalized form of Satta Matka gambling where participants bet on various outcomes.
The game involves betting on numbers, which are then drawn randomly. Players place bets on these numbers, and if their selected numbers match the ones drawn, they win money. It's important to note that while it was popular in India, it's also considered illegal in many places due to its association with gambling and the potential for exploitation.