Not long ago I had to visit my bank. Yes, I actually had to go down to the branch, walk in and talk to someone. I needed to make a deposit and this one was too big to be done via my smartphone. That’s a nice problem to have of course, but it’s inconvenient because the closest branch is not really close at all. I handed the friendly teller my check and deposit slip. She then asked for my ID. Apparently, they don’t want just anyone depositing money into my account. I handed over my new driver’s license so there was little doubt I was who I claimed to be. I took my receipt and walked out.
Comparing a person to the ID they present is not a foolproof way to ensure they are who they say they are, fake IDs are not THAT difficult to obtain after all, but it’s better than nothing. It’s certainly better than the way so many companies verify your identity: with your Social Security Number (or government ID outside the US).