What is Ethereum

Blockchain was popularized by the anonymous person (or group) Satoshi Nakamoto when they released the Bitcoin Network in 2009.

Bitcoin is a blockchain network specialized for cryptocurrency, mainly handling BTC transfers across the network without intermediaries or a trusted authority — while keeping the network itself secure and unhackable.

(P.S. The Bitcoin network may also be the world's greatest bug bounty — if you can hack it, you become a trillionaire instantly.)