Blockchain wallets use cryptographic keys to manage users’ digital assets on a blockchain. Each wallet contains a pair of keys: a public key, which is used as an address to receive funds, and a private key that must be kept secret as it enables access to the funds stored in the wallet. There are different types of blockchain wallets, including software wallets (desktop, mobile, web-based), hardware wallets (physical devices), and paper wallets (printed QR codes). Each type offers different levels of security and convenience depending on the user's needs.