Credit Card is credit mechanism. Not a lottery.

If the mailer says you have won a grand prize and hence free credit card, immediatly get cautious. For getting such deals you must deposit money with the bank and lose interest on that. You can then spend the money till on the card till your balance runs out. Is it a credit card? or is it a debit card? Well you got to ask this question yourself. Well, again this is not it. Take this, if you delay paying your bill pay a ransom as a late charge, pay unheard interest rate on due amount etc. And you also get reported to credit beuro so that you never receive a loan again.