A hot wallet keeps keys on an internet-connected device for fast spending and DeFi use.
Browser extensions and mobile wallets are typical hot wallets. Convenience trades off against malware and phishing risk.
In research workflows, Hot wallet is usually interpreted with Cold wallet, Crypto wallet, Phishing, and Custody rather than as a standalone signal. Operational security mistakes are irreversible on most public chains. Verify networks and destinations before large transfers.