An SBI credit card is issued by the State Bank of India which allows the card holder to make purchases and transactions. It comes in the form of a plastic card which has a pre-approved credit limit. You can pay for the purchases made when you receive your bill. Generally, the interest-free period or the grace-free period varies from 25-55 days. As long as you pay back the money you borrowed within this period, you don’t need to pay extra in the form of hefty interest charges. A credit card comes in handy for making various transactions, especially huge ones, as opposed to carrying big amounts of cash.