A cryptocurrency app allows users to buy, sell, and store cryptocurrencies such as Bitcoin and Ethereum. It typically provides real-time pricing information and news updates, as well as a secure wallet for users to store their digital assets. The app may also allow users to track their portfolios and transactions, and may offer additional features such as the ability to set up price alerts and to track the performance of specific cryptocurrencies. Some apps may also provide access to exchanges or other trading platforms, allowing users to buy and sell cryptocurrencies directly from within the app. Overall, a cryptocurrency app provides a convenient and secure way for users to manage their digital assets on the go.