This research report provides an overview of biometric authentication and its technologies, applications, challenges, and future research directions. The report identifies gaps and provides solutions for the identified issues. The technologies discussed include fingerprint recognition, retina scanning, iris recognition, voice recognition, and face recognition. The challenges identified include data integrity, requirement of extra hardware, high cost, and inability to update data. The gaps identified include lack of trustworthiness, lack of threat analysis, and complexity of hardware implementation. Future research directions include the use of Internet of Things technology to mitigate the identified gaps.