Hardware wallets are physical items (often a type of USB drive). The Ledger Nano X, Trezor and KeepKey are popular names in hardware wallets. Hardware wallets are considered the most secure type of wallet. It is the best choice if you invest large amounts at a time and don’t plan to trade regularly. Hardware wallets are called cold wallets. Cold wallets use keys created on a device that has never had access to the internet. Cold wallets are also known as hardware wallets, which are wallets stored on physical devices.