Here are some of the biometric system services that are commonly available:

• Fingerprint Recognition:
  

  This is the most common type of biometric authentication, where a person's fingerprints are scanned and compared with the existing database to verify their identity.

• Facial Recognition:
  

  This biometric system uses a camera to capture an image of a person's face, which is then analyzed to verify their identity.

• Iris Recognition:
  

  This technology uses a camera to capture an image of the person's iris, which is then analyzed to verify their identity.

• Voice Recognition:
  

  This biometric system uses a person's unique voice patterns to verify their identity.

• Palm Recognition:
  

  This biometric system uses a camera to capture an image of the person's palm, which is then analyzed to verify their identity.

• Retina Recognition:
  

  This technology uses a camera to capture an image of the person's retina, which is then analyzed to verify their identity.

• Signature Recognition:
  

  This biometric system uses a person's unique signature to verify their identity.

• DNA Analysis:
  

  This is the most advanced form of biometric authentication, which uses a person's DNA to verify their identity.