In 2008, an anonymous person or group of people using the pseudonym Satoshi Nakamoto created Bitcoin, the first and still most widely used decentralized cryptocurrency. Unlike traditional fiat currencies, which are controlled by central banks, Bitcoin is controlled by its users.
Bitcoin is also unique in that there will only ever be 21 million bitcoins in existence.
Satoshi Nakamoto is the name used by the unknown person or persons who designed bitcoin and created its original reference implementation. As part of the implementation, they also devised the first blockchain database.
In the process they were the first to solve the double-spending problem for digital currency using a peer-to-peer network. They were active in the development of bitcoin up until December 2010.
Since then, various individuals have been speculated to be Nakamoto by journalists, central bankers, and cryptographers, but as of October 2020 no definitive evidence has been provided to support any of these claims.
So who is Satoshi Nakamoto? Unfortunately, we may never know for sure. But what we do know is that they created a revolutionary technology that has changed the world forever.