Bitcoin is a form of digital currency, a decentalized type of money that is completely virtual. Unlike fiat currencies, there is no central bank controlling it. It uses blockchain to perform transactions on a peer-to-peer network without the need of traditional intermediaries like banks and governments.
Bitcoin is the first cryptocurrency, first introduced by a person (or perhaps a group of person) named Satoshi Nakamoto in 2019. It was created with the vision to compete against the gold and fiat currencies by acting an alternative asset.
Now, Bitcoin is widely used across the world and has the highest market cap among 40,000+ cryptocurrencies out there.