Real-name ticketing means your ticket is linked to your identity, which for a foreign visitor means your passport. In China, trains and some major sights work this way.
For trains, foreigners must show a passport to buy a long-distance ticket and to pass platform gates, because travel is ticketless[1]. There is no paper stub to carry, so your passport is the ticket.
Where you will meet it on a trip
You will meet real-name ticketing at train stations and at popular attractions. The Forbidden City is one example: every visitor needs a real-name advance reservation and same-day walk-up entry is not available[2].
One practical tip
Keep the booking passport in your day bag and give each family member their own booking. Expect an X-ray bag check at the station entrance, and arrive 30 to 40 minutes before departure at major stations[3]. Gates take longer with a group.
Use the same spelling as your passport on every app and booking. Our guide to booking attraction tickets shows how the reservation works in practice.