Was ist eine Bitcoin Geschenkkarte?

Could you elaborate on the concept of a "Bitcoin Gift Card" and explain how it works in the realm of cryptocurrency and finance? As a professional in this field, I'm curious to know how such a card functions, its use cases, and how it differs from traditional gift cards. I understand that with the rise of digital currencies, new payment methods are emerging, but I'm unsure how a Bitcoin Gift Card specifically fits into this ecosystem. Clarifying its functionality and advantages would be greatly appreciated.