It is a type of card that can be used if the products you produce are lost.
For example, you are manufacturing lock. Your customer has purchased the locks you have produced and even lost the key and even the spare keys after a while. So what happens now? How will our customer's new key be produced?
That's where security cards come in. When your customer brings you the security card you received with the lock, you can easily generate the key introduced to the system with that card and ensure the trust of your customer.