A wallet in blockchain is a digital tool or software application that allows users to securely store, manage, and transact with cryptocurrencies and digital assets. Wallets can be categorized into hot wallets (connected to the internet) and cold wallets (offline storage), each offering different levels of security and accessibility. Wallets typically include features such as address generation, transaction history, and private key management, enabling users to send, receive, and monitor their cryptocurrency holdings with ease.