A credit card CVV (Card Verification Value) is a 3 or 4 digit security code printed on the back or front of a credit card, which is used as an additional security feature to verify the authenticity of the card during online or phone transactions. The CVV is not embossed on the card and is typically required to complete transactions where the card is not present physically. The CVV is also known as the CVC (Card Verification Code) or CSC (Card Security Code).
XML validation helps to ensure the integrity and consistency of data being integrated from different sources and formats. By validating XML documents against a specific schema or DTD, it is possible to verify that the data being stored or transferred meets the required standards and specifications. This helps to prevent errors, inconsistencies, or invalid data from entering the data management system, which can negatively impact the accuracy, reliability, and overall quality of the data. By ensuring that data meets the appropriate validation criteria, XML validation supports data interoperability between different systems and applications and helps to ensure that data from various sources can be easily integrated and processed.