A cryptocurrency wallet is a software or hardware device that allows you to save, send and receive cryptocurrency. It is used to store the private keys needed to access cryptocurrency funds to perform transactions with those funds. 

Crypto wallets allow users to manage their cryptocurrency assets, check balances, and send and receive cryptocurrency. 

Crypto wallets come in different types: software (on a computer or mobile device), online (web applications), hardware (physical devices), and even paper wallets (printed on paper). It should be remembered that the security of a crypto wallet plays a big role, so it is important to choose a reliable and proven solution.