The EU digital COVID certificate (previously defined “digital green certificate”) will facilitate the free and safe movement within the EU.
It will be proof that a person has been vaccinated against COVID-19, or has undergone tests with a result negative, or cured of COVID-19.
The certificate can be used in all EU member states, as well as in Iceland, Liechtenstein and Norway. Contacts are also underway to allow its use with Switzerland.
The Commission is working to ensure that the certificates are compatible with the systems of other non-EU countries.
More details are avaliable here: https://ec.europa.eu/info/live-work-travel-eu/coronavirus-response/safe-covid-19-vaccines-europeans/eu-digital-covid-certificate_en