A hardware wallet is a special type of wallet that stores the user's private keys in a secure hardware device. The private keys never leave the device, ensuring that there is no risk of losing funds even if the device is exposed to a potentially infected computer. Hardware wallets offer the security of a cold wallet or paper wallet but with the benefit of accessibility similar to hot wallets.
Trezor devices are hardware wallets. The Trezor hardware architecture is public and the Trezor bootloader and firmware are completely open-source, which allows the user to independently verify the functionality and security of Trezor devices. With the Trezor Wallet and Trezor Bridge, using your Trezor device is as convenient as using a web wallet.