"Hashing" is preferable to storing a personal identifier, such as a driver’s license number, because it still provides a method for customer identification but in a form that would not reveal the real number. Hashing is a security technique that converts data into a fixed-size string of characters, which is typically a hash code. The hash code represents the original data but does not allow it to be reconstructed or decrypted. In the context of data security, hashing is valuable because it protects sensitive personal identifiers from exposure while still enabling the organization to verify or match the hashed data with incoming hashed inputs for identification purposes.