Common hotel cards include membership cards, room cards, IC cards, and ID cards, each with distinct uses: Membership cards: General identity credentials, similar to membership tools in malls or gyms, used for identity verification scenarios. Room cards: Core function is door access. Guests get them at the front desk and swipe to enter rooms (usually via a back magnetic stripe), acting as personal keys. IC/ID cards: More versatile and secure, enabling points accumulation, card payments, and door access.