TREZOR helps a person to securely sign in the transaction messages.
Yes, you are absolutely correct.The Bitcoin protocol works by sending signed notes of payment across the Internet. These messages (which are referred to as Transactions) are signed using a special algorithm.
In order to sign a Bitcoin transaction, you need to have a special key or password. TREZOR holds that key. Since TREZOR’s job is to help you securely sign Transaction messages, you can think of your TREZOR as a modern-day stamp. TREZOR is better than an ordinary mechanical stamping mechanism, however. Each TREZOR has a PIN code. If your TREZOR gets stolen, thieves cannot misuse it to steal your money. Due to TREZOR’s clever design, even if the computer with which you use your TREZOR is hacked, the hackers will never know your PIN.