Biometrics is the measurement of physical and behavioral characteristics to verify identity. Biometric devices scan characteristics like fingerprints, DNA, or retinal patterns and convert them to digital form for storage and comparison to databases. When used in schools, students' fingerprints are scanned and stored in a database so they can be compared to authorize delivering the meals parents selected online. This allows parents to choose healthy, affordable options and ensure students only receive the approved foods. Biometrics in schools is also used for library book checkouts.