Bitcoin is a digital currency that was created by Satoshi Nakamoto in 2009.It is created electronically and impossible to control it.This currency are not printed currency like dollars or euros.Running computer all around the world are producing it.Owing to this reason they are different from other currencies.
Probably because it gain its reputation as the most trusted,most utilized and the first of its kind digital currency invented and its value is still increasing up to this point because it only has a total of 21 million in supply in the market and its decentralized with the concept of blockchain technology that is why its a lot more different than the other currency or even fiat money.