Single Sign-On (SSO) is an essential authentication method that provides increased security and convenience to users by using a single set of credentials for accessing multiple applications. It diminishes the multiple-password requirement, decreasing the vulnerabilities of weak passwords and phishing threats. SSO simplifies IT management, minimizing user provisioning and deprovisioning, adhering to security policies. While it adds risks as well, in that an compromised account would provide unauthorized access to several systems, organizations must take steps to mitigate these by employing multi-factor authentication (MFA), session timeouts, and continuous monitoring. Used in combination with best practices, SSO enhances security and streamlines operational efficiency.