In cryptocurrencies, a transaction fee (or shortly fee) is a payment to the miners for adding a transaction into the blockchain. When a transaction has been included in the blockchain, it is considered confirmed. The size of the fee sent with the transaction determines the confirmation time.
Transaction fees in Trezor Wallet
Trezor Wallet allows you to determine the size of the fee to send with a transaction: low, economy, normal or high. It is also possible to set a custom fee. However, it is essential to make sure the fee will be sufficient for the confirmation time you are trying to achieve; sending a transaction with a fee that is too low might mean that the transaction never gets confirmed.