What 'vaccine passports' mean for your summer vacation

The words "vaccine passport" have a reassuring ring to them, perhaps conjuring up the image of a sleek, embossed document with watermarked pages and official stamps of approval. Flourished at border controls, it would open travel doors that, for so many of us, have been closed by Covid-19.

source https://www.cnn.com/travel/article/vaccine-passports-summer-2021/index.html