Before diving into the specifics of Trezor.io/start, it's important to understand what a Trezor hardware wallet is. A hardware wallet is a physical device that stores your cryptocurrency private keys offline, making it immune to online threats like hacking and phishing. Trezor wallets are small, USB-like devices that connect to your computer or smartphone. By using a hardware wallet like Trezor, users can safely store their cryptocurrency assets, sign transactions, and manage their funds without exposing their private keys to the internet.