A hardware wallet is a physical device that stores your cryptocurrency private keys offline and signs transactions without exposing those keys to your computer or phone.
When you want to send crypto, the transaction is prepared on your computer, then sent to the hardware wallet for signing. The signature is created inside the device and returned, so the private key never touches the internet.
Exchanges and software wallets can be hacked. A hardware wallet removes the most common attack surface by keeping your keys physically isolated.
Hardware wallets protect against malware, keyloggers, phishing sites that drain hot wallets, and the collapse or hack of a custodial platform.
For anyone holding more than a small amount of crypto, a hardware wallet is widely considered the safest way to store it.