$SUI is a person or group under the name "Satoshi Nakamoto". It is considered the first decentralized currency, meaning it is not controlled by banks or governments. It relies on blockchain technology that records all transactions transparently and securely. Anyone in the world can send or receive Bitcoin without an intermediary, just over the internet. The number of Bitcoins is limited to 21 million, which causes its value to increase over time. Some use it as an investment, while others use it for online purchases. Despite its price volatility, many consider it the future of money.