There are several types of credit cards as bank, home, and travel and entertainment cards. So I would like to talk about last ones, the most known of them are American Express, Dinners Club, Chase, MasterCard and Visa.
Using these cards is very simple you needn't take lots of cash and worry about it. It gave people little freedom from rate exchange. And as result you will enjoy with your rest. Of course there are technical disadvantages, however it worth to use credit cards.
The heart of any card is microchip which contains information about owner security code, debit and credit information etc. This chip is very small itself. So I have one idea to implant it under the hand skin. This will take double use first you will never lose or forget your travel card and the second only you will use it, nobody without you will be able get it.
What do you think about this?