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The approach that reduces the need to sign into multiple systems is known as Single Sign-On (SSO). SSO is a user authentication process that allows a user to access multiple applications with one set of login credentials. This streamlines the login process, enhances user convenience, and reduces the number of passwords a user must remember.

With SSO, after the initial authentication, users can navigate between different applications without needing to log in again for each one. This reduces the chances of password fatigue, where users might reuse or choose weaker passwords for different services. SSO also improves security as it centralizes authentication, making it easier to enforce strong security measures and manage credentials.

Comparatively, while multi-sign-on suggests managing multiple single sign-ons, it does not provide the same holistic integration as SSO. Auto-login typically allows automatic access based on saved credentials, but does not necessarily centralize this across multiple services. Access federation involves linking multiple identity management systems but does not solely focus on the user experience of signing in. Therefore, Single Sign-On is the most effective and user-friendly approach for reducing the need to repeatedly authenticate across various systems.