Explainer: How will the EU’s Covid-19 digital green certificate work?

The digital green certificate will offer digital proof that a person has either been vaccinated against Covid-19, received a negative test result or has recovered from Covid-19 in the last six months.

Phone, keys, boarding pass, passport… There will be a new thing to add to that airport checklist from July 19 - your EU digital green certificate. But what exactly does it prove, where is it valid and how long will it be in use?

What will it prove?