> For the complete documentation index, see [llms.txt](https://authdocs.skill-mine.com/licentio-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://authdocs.skill-mine.com/licentio-documentation/introduction.md). # Introduction Auth helps you build the sign-in experience, MFA, Payment Gateways, KYC, SSO, and user identity within minutes. #### Main features: * An OIDC-based identity service * MFA with various options (Face, Fingerprint,, Backup Codes, FIDO 2, TOTP, Email, and SMS) * Multi-platform user sign-in/up experience with SDKs (Web, iOS, and Android) * Sign-in/up with dynamic SMS/Email passcode * Sign in/up with a biometric option. * Out-of-box social sign-in integration (GitHub, Google, etc.) * A web UI to control all above (Admin Console) * Out-of-box SSO support with SAML 2.0, Rest, OAuth2, OIDC, Kerberos, WS-Fed and LDAP. * Extendable multi-language support Also, we call it "[customer identity access management](https://en.wikipedia.org/wiki/Customer_identity_access_management)" (CIAM) or "customer identity solution." ### Basic concepts​ Before we start, it'll be good to know how Auth works. To simplify, we divide Auth into four parts: Admin Console, Sign-in Experience, Core Service, and SDKs. * **Admin Console** is a web app that will be your friend for customizing sign in and managing users. * **Sign-in Experience** is the UI that directly faces your end-users, including signing in, creating an account, etc. * **Core Service** is the foundation of Auth, which provides essential APIs to support everything else. * **SDKs** are the bridges between your application and Auth.