When referring to computers and security, biometrics is the identification of a person by the measurement of their biological features. For example, a user identifying themselves to a computer or building by their finger print or voice is considered a biometrics identification. When compared to a password, this type of system is much more difficult to fake since it is unique to the person.
Like the picture shown on this page a biometric finger scanner identifies the person by their finger print. These can be a secure method of identifying a person, however, cheap and less sophisticated finger print scanners can be duped a number of ways. For example, in the show Myth Busters they were able to fake a finger print using a Gummy Bear candy treat.
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