A vaccine passport is proof that you’ve tested negative for or been protected against certain infections. It can be digital, like a phone app, or physical, such as a small paper card. You can carry it with you and show it if required, like before you go into the office, board an airplane, or visit a restaurant, movie theater, or gym. As the COVID-19 pandemic continues, the idea is that with a vaccine passport system in place, companies could fully open for business to anyone who shows proof of vaccination. Countries might resume international travel without requiring quarantines. This would help boost economies while limiting the spread of the disease.