DIN 126, a standard established by the German Institute for Standardization, outlines the specifications for the design and construction of identification cards. This standard ensures that identity cards, such as national ID cards, employee badges, and membership cards, meet specific requirements for size, material, and security features. By adhering to DIN 126, manufacturers can guarantee that their identification cards are compatible with various card readers and meet the necessary security standards, thereby preventing fraudulent activities and ensuring the integrity of sensitive information.