Bitcoin is a currency or an asset, has been a topic of debate since many years. I think it depends on how you view it based on your perspective. However, it is largely seen as serving both purposes, as it can be used to buy goods and services like any fiat currency, fluctuates like fiat currencies and commodities. Simultaneously it is considered a store of value and hedge against inflation. In summary the classification of Bitcoin can differ across jurisdiction and the context it is being discussed.