Unique physical attributes such as fingerprints and retinas have long been used as personal identifiers. With the emergence of biometric security solutions, these markers are used more widely, with inexpensive scanners now built into devices including smartphones and laptops, providing an additional layer of security which helps identify who you are by scanning your face, fingerprint or voice. Biometric security is often combined with another measure, such as a password or text-to-mobile to create two- factor authentication solutions.