Bitcoin can be used to pay for things electronically if both parties are willing. In that sense, its like conventional dollars, euros, or yen, which are also traded digitally.
But is it differs from fiat digital currencies in several important ways?
so simple like it can be illustrated by a elementary pupil, you have a $100 dollar paper bill ,
put it in your wallet the value will stay as it is.buy bitcoin with your $100 , keep it stored in your digital wallet /hardware wallet ,
wait for pump sell it ,the value is different. This is just one reason why bitcoin is distinctly different from tangible currency.