How is a chip-enabled debit card more secure?
The chip adds another level of security to your Walmart MoneyCard transactions by requiring your chip-enabled card to produce a code that is used to validate the transaction. In other words, your transaction at a retail terminal prevents use of counterfeit cards. The chip itself makes the information on your card more difficult to steal – defending your account more prominently from fraudulent activity.
Related questions
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Can I now tap my chip-enabled debit card to purchase at the register?  - 
    
Where can I use my chip-enabled debit card?  - 
    
Is a ‘chip-enabled card’ & an ‘EMV chip’ the same thing?