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A fingerprint scanner is a type of technology that identifies and authenticates the fingerprints of an individual in order to grant or deny access to a computer system or a physical facility.
It is a type of biometric security technology that utilizes the combination of hardware and software techniques to identify the fingerprint scans of an individual.
A fingerprint scanner typically works by first recording fingerprint scans of all authorized individuals for a particular system or facility. These scans are saved within a database. The user requiring access puts their finger on a hardware scanner, which scans and copies the input from the individual and looks for any similarity within the already-stored scans. If there is a positive match, the individual is granted access.
Fingerprint scanners most commonly use an individual's thumbprint as identification.