"Vaccine passports" are digital or paper documents that show you were vaccinated against Covid-19 and could help you get into a growing number of places. What they look like and why you might want one depend on where you live, but more private venues, workplaces and governments are requiring proof of vaccination in public settings. Europe and US states like California and New York created official digital credentials that let you verify your Covid-19 immunisation record and convert it into a scannable QR code you can pull up on your cell phone.