There are numerous types of digital currencies available today, each with its own unique features and characteristics. Here are some of the most popular types of digital currencies:

1. Bitcoin: Bitcoin is the first and most well-known digital currency, created in 2009. It is decentralized and operates on a blockchain network.

2. Ethereum: Ethereum is a decentralized platform that enables the creation of decentralized applications (dApps) and smart contracts. Its digital currency is called Ether.

3. Ripple: Ripple is a digital currency designed for use by banks and financial institutions. It aims to provide fast and secure international payments.

4. Litecoin: Litecoin is a decentralized digital currency that operates on a blockchain network similar to Bitcoin. It is designed to provide faster transaction times and lower fees.

5. Bitcoin Cash: Bitcoin Cash is a digital currency that is a fork of Bitcoin. It was created in 2017 to address some of the scalability issues of Bitcoin, such as slow transaction times and high fees.

6. Tether: Tether is a stablecoin that is pegged to the US dollar. It is designed to provide stability and reduce volatility in the digital currency market.

Overall, these digital currencies are just a few examples of the many types of digital currencies available today. As the digital currency market continues to grow and evolve, we can expect to see new types of digital currencies emerge, each with its own unique features and use cases.