Authentication in real projects manifests in diverse forms, crucial for securing access and data. A ubiquitous example is username and password-based authentication, commonly seen across web and mobile applications where users provide unique credentials to log in. For seamless third-party service integration and social logins, OAuth 2.0 and OpenID Connect are widely adopted, enabling users to grant limited access without sharing their primary credentials directly. Furthermore, backend services and APIs frequently rely on API keys or JSON Web Tokens (JWTs) for secure programmatic access and stateless authentication, especially within microservice architectures or Single Page Applications. Finally, many platforms enhance security with Multi-Factor Authentication (MFA), requiring an additional verification step like a code from an authenticator app or SMS to confirm identity. More details: https://www.ironhidegames.com/external?url=https://epi-us.com