Single Sign-On (SSO) offers security and ease of use benefits by providing painless access to many applications based on a single sign-on. SSO diminishes password-risk-related threats, enhances user productivity, and simplifies IT. Organizations using SSO enjoy centrally managed access control, which aids in enforcing security policies and following industry regulations. SSO creates possible security threats—if breached, it can give unauthorized access to several systems. To avoid these risks, deploying **Multi-Factor Authentication (MFA)**, **real-time monitoring**, and **role-based access controls (RBAC)** is critical. A properly implemented SSO system has to balance simplicity of use with robust security for today's businesses.