A covid-19 vaccine passport is like a special paper that says you got your medicine to protect you from getting sick with covid-19. It's like a card that shows you did what you needed to do to stay healthy.
The passport can be shown to other people like your teacher or your doctor to prove you got your medicine. This can help protect you and other people from getting sick. It can also help people travel to different countries where they might need to show proof that they got their medicine.
But remember, just like a regular passport, you need to keep your covid-19 vaccine passport safe and not lose it. And even if you have the passport, it's still important to keep washing your hands and wearing a mask when you need to.