Biometric authentication has become increasingly popular, with more than half of users employing it daily, resulting in a variety of methods available for verifying identities. Common physiological methods include facial recognition, fingerprint scanning, iris/retina recognition, voice recognition, and hand geometry, each with its own strengths and limitations in terms of security, accuracy, usability, and cost. Emerging technologies like DNA, gait, and vein recognition, although still niche and expensive, offer promising future applications. When selecting a biometric method, factors such as security, accuracy, user experience, and cost must be considered. FIDO authentication standards have been widely adopted, offering secure and seamless authentication by keeping biometric data on the user's device. Companies like Descope provide tools to easily integrate biometric authentication into apps, enhancing security and user experience without requiring extensive technical expertise.