Ethereum

### What is Cryptocurrency?

Cryptocurrency is a digital currency secured by cryptography, operating on decentralized technology called blockchain. Unlike traditional money, it's not controlled by any central authority.

#### Key Points:
- Blockchain: A transparent, secure ledger of transactions.
- Decentralization: No central control, unlike banks.
- Bitcoin: The first and most famous cryptocurrency, launched in 2009 by Satoshi Nakamoto.

Thousands of other cryptocurrencies (altcoins) exist, like Ethereum and Litecoin. Cryptocurrencies offer new investment opportunities and financial innovations.