Single Sign-On (SSO) is a secure sign-on procedure that allows one login to access several applications, with the twin benefits of security and ease. Reducing the requirement to remember multiple passwords, SSO brings down the risk of credential-based attacks like phishing and brute-force attacks. Organizations enjoy streamlined identity management, better regulatory compliance, and lower IT support expenses. Yet, SSO can be a point of failure if it is not adequately secured. To reduce risks, companies must implement Multi-Factor Authentication (MFA), implement least privilege access controls, and have real-time security monitoring to identify and prevent unauthorized access.