What does it mean to swipe the hotel room card? I heard what others said today, and I don't know what it means.

When you check in, the front desk will give you a room card.

Entering the room, the room card is equivalent to the key. It can be opened with a brush on the induction door. Then insert the room card into the induction slot next to the door. There is electricity in the room. There are some more advanced hotels. You have to swipe your room card when you get on the elevator. You can press the floor.