A key in cryptocurrency refers to a string of characters used to access and manage digital assets. There are two main types: public keys and private keys.A public key is like an address. It can be shared with others to receive funds. When someone wants to send cryptocurrency to you, they use your public key. This key is derived from a private key through a cryptographic process.A private key is highly sensitive and must be kept secret. It allows you to sign transactions and spend your funds. If someone gains access to your private key, they can control your assets, so it’s crucial to store it securely.Both keys are part of a cryptographic pair, ensuring security in transactions. The interaction between the public key and private key forms the backbone of ownership and transfer of digital currencies. Understanding how they work is essential for anyone involved in buying, selling, or holding cryptocurrencies.