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.

Great summary! Blockchain technology is indeed the backbone of cryptocurrencies, providing a secure and transparent way to verify transactions.