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Biometrics is a new technology made mostly for security. It allows fingerprint scanning, voice recognition, and retinal scans to be used for securing certain objects and documents. Using these technologies is much more secure than password because only a certain person can get to them.
Many countries are using this technology now for security reasons.
Examples of Biometrics
An example of biometric technology at Disney World theme parks where tickets require a persons finger print to make sure the ticket is used by the same person.