# Overview The Biometrics SDK is a tool developers can use to integrate biometric authentication and identification into their applications. Biometrics authentication is executed using two different features; liveness detection and facial recognition. This SDK is primarily used alongside Valify's OCR services to match the user's face to their ID to securely and accurately authenticate and verify the user's identity. The Biometrics SDK offers a simple and configurable user-friendly interface that enables the seamless capture of biometric data to perform the necessary checks. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://valify.gitbook.io/valify-ios-sdk-documentation/biometrics/overview.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.