What is the interest-free (grace) period on a credit card?

The interest-free period or grace period of crediting (from the English grace period) is the period during which the bank does not charge interest on card purchases. The grace period does not apply to debt arising from such transactions as cash withdrawals from a card or account, transfers, and quasi-cash transactions.  

The interest-free period starts with the first cashless debit transaction of the month to which the interest-free period terms apply, and its duration depends on the card type:  

for the "Cashback Credit Card" - up to 62 days 

for the credit card "120 Days to the Maximum" -  up to 120 days. 

More details on how the grace period works for the card "120 Days to the Maximum" and the "Cashback Credit Card", how to make payments and which transactions the grace period does not apply to.