What is Carding? Is Carding Illegal in India?

“Bro, I am getting an iPhone 11 Pro Max in Rs 20k. Should I buy it? He’s saying that he into some carding business. What is Carding? Is Carding Illegal in India? Will I be in trouble?”
I have not seen this on Whatsapp but the concept of carding is highly visible on platforms like Instagram and Telegram.
So you will get a random message which will be saying something like, “Sir, I am into carding business. I can manage a smartphone in 10% of its price. This discount is only for you for a limited time. Are you interested?”