I'm not an American. In Estonia your ID is entirely digital, and I just show my e-Estonia government provided app to a scanner, which can scan my ID from there

I'm not an American. In Estonia your ID is entirely digital, and I just show my e-Estonia government provided app to a scanner, which can scan my ID from there and verify it. Same with a drivers license. As long as I travel within EU I also don't need to carry a passport with me as a EU citizen.