This guide explains how to utilize ZITADEL for user authentication within your applications using OpenID Connect (OIDC). Here, we offer comprehensive guidance on seamlessly integrating ZITADEL's authentication features, ensuring both security and user experience excellence. Throughout this documentation, we'll cover the setup process for ZITADEL authentication, including the recommended OIDC flows tailored to different application types. Additionally, we'll provide clear instructions on securely signing out or logging out users from your application, ensuring data security and user privacy. With our guidance, you'll be equipped to leverage ZITADEL's authentication capabilities effectively, enhancing your application's security posture while delivering a seamless login experience for your users.