*Cryptocurrency* is a *digital currency* that is *transacted over the internet* and is *not controlled by any bank or government*. It is based on blockchain technology, which keeps transactions secure and transparent.

In summary:

- 🔐 *Secure and private transactions*

- 🌐 *Decentralized*

- 💰 *Bitcoin, Ethereum* etc. are popular

- ⚠️ *High price volatility* (risky)

Suppose you want to send money to a friend. Normally, you would use a bank or bKash, right?

But using *cryptocurrency* —

👉 No bank needed,

👉 No government permission required,

👉 Just an internet connection and a *digital wallet*, and you can send money anywhere in the world.

🎯 Example:

- *Bitcoin* = digital money (most popular)

- *Ethereum* = not just money, but contracts too.