Credit cards give online gamblers simplicity and ease of use. Most customers already have a credit card in their wallet available for use and more likely than not, it’s a MasterCard. This makes deposits in online casinos and payments at any online store an easy and convenient experience. The downside to going with convenience and comfort is a relatively low standard of security. While MasterCard certainly takes all steps to make keep your information as safe as possible, the bottom line is that your information is still out there. If security is your number one priority, even an eWallet would be a better option through bank transfers are the most secure.