You can use the kiosk to print out your luggage tags or at some airports you can do the curbside check in or if flying business or first class go to the counter.
You can swipe a CC, DR license, scan your paperless ticket's bar code, or some will take a machine readable passport.
After that, you get in line for check in. Show ID, get you bags weighed, and pay the luggage fee if applicable.
I don't know if ALL airlines do this, but I have not flown on one that doesn't.
SS Norway (12 times) '85 - '97; Radiance OS 06/01; Island Princess 11/04, Grand Princess 11/04/05, Golden Princess 7/21/06, Golden Princess 2/24/07, Explorer of the Seas 12/23/07, Island Princess 11/15/08