Which kind of security system allows or denies access to places or resources based on physical characteristics?

Physical traits are used by biometric devices to identify users. Biometric systems include fingerprint/palm/hand scanners, retinal scanners, face scanners, and DNA scanners. You must successfully complete a physical screening process in order to access resources. Bollards are vertical posts used to restrict vehicular traffic. ID badges frequently communicate with readers using RFID (radio frequency identification) to confirm your identity. Tokens are frequently used in multifactor authentication and can be either hard (like a key fob) or soft (like software on a system).