Why the change? The new chips are expected to improve credit and debit card security. Data on cards with the older technology is much easier for crooks to steal because the information on the magnetic strip is static and can be copied. As a result, a thief can use your card for multiple fraudulent transactions. Cards with the new chip are different. Every time you use an EMV card, the chip creates a unique transaction code. As a result, the newer cards aren’t as useful to counterfeiters and card thieves.