Biometric data is a type of data that is based on the physical characteristics of a human being, including fingerprints, voice input, facial images, and iris scans. The integration of biometric data into mobile applications presents challenges for QA teams, such as collecting accurate real-world data, ensuring compliance and ethics issues, safeguarding user privacy, handling biometric input failures, simulating biometric data entry, and updating testing workflows to ensure reliable and secure use of biometric data. To address these challenges, QA teams must work alongside security engineers and legal advisors to develop strategies for addressing them through software testing, such as building a continuous testing loop, performing usability testing with biometric data, and ensuring backup input methods are available when biometric input fails.