Single Sign-On (SSO) is an important authentication mechanism that improves security and convenience by enabling users to access multiple applications using a single sign-on. It eliminates password fatigue, decreases the threats posed by weak or duplicated passwords, and simplifies IT management by consolidating authentication. Organizations gain better compliance, reduced user provisioning time, and fewer password reset requests. But SSO also carries security threats—if one credential is stolen, it can provide unauthorized access to many systems. To address this, organizations must deploy Multi-Factor Authentication (MFA), use risk-based authentication, and perform routine security monitoring to identify possible threats.