Trezor is a wallet for secure transactions in cryptocurrencies. He was a pioneer of cold storage and for many has become the security standard for storage and transactions with Bitcoin and other cryptocurrencies.
When using the wallet, your transactions are safe even on an unsecured computer thanks to modern cryptography and closed transactions that take place only inside the wallet architecture.
All your transactions are confirmed by pressing a button, and the connection of the wallet is accompanied by the introduction of a pin code. If you lose your wallet, you can always restore your funds using private keys.