$ETH

Here's a 100-word overview of cryptocurrency:

Cryptocurrency is a digital or virtual currency secured by cryptography. Transactions are recorded on a decentralized, public ledger called a blockchain. Key features include decentralization, digital existence, limited supply, and secure transactions. Popular cryptocurrencies include Bitcoin, Ethereum, and Litecoin. Cryptocurrencies offer an alternative to traditional fiat currencies and have sparked innovation in the financial technology (fintech) industry. They provide a new way to transfer value and have potential applications beyond digital payments. As the market continues to evolve, it's essential to understand the benefits and risks associated with cryptocurrencies. Research and education are crucial for navigating this space.