What is Vaccine Passport and why is London protesting against it?

To curb the COVID-19 infection, countries are coming with different strategies. Most recently, the introduction of vaccine passports has created a stir all over. These documents will showcase you were fully vaccinated against the Coronavirus. They could help you get into places such as stadiums or even countries that are looking to reopen safely. Meanwhile, to oppose it, people in a large number protested in Paris.