The primary benefit of a single sign-on (SSO) system is that it simplifies user access to multiple applications and services with just one set of login credentials. By reducing the need to remember various passwords, SSO improves user experience and decreases password fatigue. This also enhances security, as users are less likely to employ weak passwords or reuse them across different platforms. Additionally, SSO streamlines administrative processes, enabling easier user management and quicker onboarding while maintaining compliance with organizational security policies.