Name three popular cryptocurrencies besides Bitcoin.

Three popular cryptocurrencies besides Bitcoin are:

1. **Ethereum (ETH)**:
   - Ethereum is a decentralized platform that enables developers to build and deploy smart contracts and decentralized applications (DApps). It introduced the concept of programmable blockchain, allowing for a wide range of use cases beyond simple peer-to-peer transactions.

2. **Binance Coin (BNB)**:
   - Binance Coin is the native cryptocurrency of the Binance Exchange, one of the largest cryptocurrency exchanges globally. Initially launched as an ERC-20 token on Ethereum, BNB now operates on its own blockchain (Binance Chain) and is used to pay trading fees on the Binance platform, participate in token sales on Binance Launchpad, and more.

3. **Cardano (ADA)**:
   - Cardano is a blockchain platform that aims to provide a more secure and scalable infrastructure for the development of decentralized applications and smart contracts. It emphasizes sustainability, scalability, and interoperability, with a strong focus on academic research and peer-reviewed development.

These cryptocurrencies have gained significant popularity and adoption in the blockchain space, each offering unique features and use cases beyond Bitcoin's primary role as a digital currency.