In a transaction, the spender and receiver each reveal to each other all public keys or addresses used in that transaction. This allows either person to use the public blockchain to track past and future transactions involving the other person’s same addresses. If a public key is used often, other people can easily track the receiving and spending habits of a person. It is, therefore, also easier to identify the owner of the address.
Therefore, to enhance your privacy, it is possible to use a fresh address for each receiving transaction. To learn how to generate new receiving addresses in Trezor Wallet, see Generating multiple addresses.