In the US we say "driver's license" because 90+% of the population has one, but the portion of the population who doesn't wish to drive can get a State ID card. The only difference between an ID card and a driver's license is on the back where it lists what types of vehicles you are allowed to drive and what types of restrictions have been placed on your driving them.

In the UK how do you prevent minors from buying alcohol if you don't have some sort of ID with DOB on it?