Wikipedia
BioAPI (Biometric Application Programming Interface) is a key part of the International Standards that support systems that perform biometric enrollment and verification (or identification). It defines interfaces between modules that enable software from multiple vendors to be integrated together to provide a biometrics application within a system, or between one or more systems using a defined Biometric Interworking Protocol (BIP) - see below.
Biometrics (measurements of physical characteristics of a person) are increasingly being used to provide verification of the identity of an individual, once they have been enrolled (one or more of their physical characteristics has been measured).
Computer systems that perform biometric enrollment, verification, or identification are becoming increasingly used. The BioAPI specification enables such systems to be produced by the integration of modules from multiple independent vendors.