In plain English
What Hot wallet means
Hot wallets are used when speed and frequent access matter. They may be software wallets on phones or computers, or custodial wallets operated by exchanges and other services. Because they stay online, they are more exposed to hacking, malware, phishing, and unauthorized access than wallets kept offline.
Why it matters
Hot wallets are common for day-to-day crypto activity, but their connectivity creates a larger attack surface. Users need to understand whether the wallet is self-custody or custodial, because that changes who controls the keys and who bears operational risk.
Example
An exchange keeps most customer assets in cold storage but uses a hot wallet to process withdrawals. If the hot wallet is compromised, the funds held there may be at risk even if the rest of the reserve is offline.
Quick answers
Common questions
Is every mobile wallet a hot wallet?+
Generally yes, if it can connect to the internet and sign transactions while online.
Are hot wallets only used by exchanges?+
No. Individuals also use hot wallets for everyday transfers and interaction with apps and services.
Sources