In addition to the standard card that you were issued when you got certified you now have the option of downloading a digital card on your phone or tablet. It's one less thing you have to remember to bring on vacation!
Here are the links for whichever card you prefer:
Standard diver card: https://apps.padi.com/scuba-diving/replacement-card/
E-card instructions: www.padi.com/ecard-faq