A passport has always given you passage to travel to destinations far and wide, but post-COVID-19, you will likely need another type of passport, a vaccine passport. A vaccine passport would be documentation (likely digital) that would allow you to prove to border officials that you've been vaccinated against COVID-19.
The idea behind a vaccine passport is that it would allow a person to resume activities that are now restricted because of the coronavirus pandemic. Regaining the ability to travel freely is getting the most attention in the debate, but that's not the only proposed benefit. Some say they also could let you eat inside a restaurant, see a movie, as well as attend concerts, sporting events, and theatre performances.
Qantas has started its first passenger trial of a digital vaccine passport system which it says will be necessary for overseas travel when Australia's international border reopens. Qantas is also encouraging passengers on its government-chartered repatriation flights to use the app as proof they have returned a negative COVID-19 test result within 72 hours of their departure, a requirement of entry into Australia.
The Federal Government will be rolling out digital certificates for vaccination using the Express Plus Medicare and MyGov apps when Australians get their jab. It is possible that they could use this for international travel too. We will wait and see.