On German trains operated by Deutsche Bahn (DB), such as the high-speed ICE or IC/EC lines, seating is divided into "Reserved" and "Free Seating." When you buy a ticket, you can choose to pay an optional reservation fee (approx. €5.50 in Second Class or included in some First Class fares). If you have a reservation, your specific car (Wagen) and seat (Sitz) number will be printed on your ticket or in the DB Navigator app. If you do not have a reservation, you can sit in any seat that is not marked as reserved. Above each seat, there is a small electronic display (or a paper slip on older trains) that shows the route for which that seat is booked (e.g., "München - Hamburg"). If the display is blank or says "ggf. reserviert" (maybe reserved), the seat is free. This "dynamic seating" allows for flexibility, though on popular routes like Berlin to Munich, a reservation is highly recommended to avoid standing in the bistro or between cars.