Platform > Authentication

# Secure authentication solutions built for the next generation of apps

Move past standard login screens. Build identity experiences that drive conversion across web, mobile, and agentic apps.

- [Get started](https://auth0.com/signup?type=button&place=platform-hero&text=get%20started)
- [Get a demo](https://auth0.com/contact-us?type=button&place=platform-hero&text=get%20a%20demo)

## Frequently asked questions

### What is Auth0 Authentication?
Auth0 Authentication is a flexible, developer-centric service that [supports a wide range of login methods](https://auth0.com/docs/authenticate/login), including username/password, social IDs, [enterprise SSO](https://auth0.com/docs/authenticate/single-sign-on), email/sms passwordless, biometrics via [WebAuthN](https://auth0.com/docs/authenticate/login/auth0-universal-login/passwordless-login/webauthn-device-biometrics) and [Passkeys](https://auth0.com/docs/authenticate/database-connections/passkeys), By using the Auth0 [Universal Login](https://auth0.com/docs/authenticate/login/auth0-universal-login), some developers can implement more secure authentication in minutes, helping ensure that user identity is verified against industry-standard protocols like OpenID Connect and SAML 2.0.

### What is 'Step-up' authentication in Auth0?
Step-up authentication is a security pattern where Auth0 challenges a user for an additional factor (like [MFA](https://auth0.com/docs/secure/multi-factor-authentication)) only when they attempt a sensitive action, such as changing a password or making a large purchase. This helps ensure high-value resources are protected without requiring MFA for every low-risk login, balancing security with user convenience.

### How does Auth0 handle cross-platform login?
Auth0 provides a unified authentication experience across web, mobile, and desktop applications. By using standardized JWTs (JSON Web Tokens), Auth0 verifies that a user's identity is recognized seamlessly as they move between different platforms in your ecosystem, maintaining a more secure session and a consistent branded experience throughout. Additionally, Auth0 also supports [Native to Web SSO](https://auth0.com/docs/authenticate/single-sign-on/native-to-web), allowing a seamless user experience transitioning authenticated users from your native app to your web app.

### Can I customize the Auth0 authentication pipeline?
Yes, the Auth0 authentication pipeline is highly extensible via [Auth0 Actions](https://auth0.com/docs/customize/actions/actions-overview). Developers can write serverless functions to trigger custom logic—such as verifying a user's age, checking a legacy database, or calling a fraud detection API—during the login process, allowing for a fully tailored security and user experience. Complementary to Actions, [Auth0 Forms](https://auth0.com/docs/customize/forms) enables developers to use a visual editor to build customizable forms for use cases such as progressive profiling, step-up authentication, and identity verification.

### Does Auth0 support biometric authentication?
Yes, Auth0 supports biometric authentication through WebAuthn and [Passkeys](https://auth0.com/docs/authenticate/database-connections/passkeys). This allows users to log into applications using FaceID, TouchID, or Windows Hello. Biometrics provide a phishing-resistant, passwordless experience that is significantly more secure than traditional credentials and offers a frictionless journey for modern mobile and web users.

### What is the difference between Universal Login and Embedded Login?
Universal Login and Embedded Login are two key ways to build conversion-friendly identity journeys. Many customers use a hybrid approach, using different solutions for different identity patterns.

[Universal Login](https://auth0.com/docs/authenticate/login/auth0-universal-login) is Auth0’s hosted identity. It’s the fastest way to roll out secure-by-design identity flows with no-code and pro-code customization options. With [Advanced Customization for Universal Login (ACUL)](https://auth0.com/docs/customize/login-pages/advanced-customizations), teams can control every pixel of the authentication experience using their own design system, tooling, and existing UI/UX investments—all on top of Auth0’s hosted authentication.

[Embedded Login](https://auth0.com/features/embedded-login) is Auth0’s most flexible option. It lets you integrate identity flows into your application code using Auth0 APIs and SDKs for complete pro-code control. Blend authentication in-app, exactly where users convert. Use Auth0 configurable capabilities and built-in security tooling to reduce security roadblocks and custom code to scale faster.