The fingerprint sensor works on the principle of processing which includes two elements like enrollment & matching.Whenever an individual needs to access the system then he places a finger on a hardware scanner, then the scanner scans & copies the input from the person & verifies with the previously stored scans for any similarity.In the fingerprint sensor working, first authorized persons' fingerprint scans are recorded for a specific system and these scans are saved within a database.These sensors are very reliable and secure devices used for any security authentication.