Single Sign-On (SSO) is an important authentication solution that eases user access without compromising security. By minimizing the use of multiple passwords, it decreases the vulnerability to weak credentials, phishing, and password exhaustion. Organizations gain from ease of user management, accelerated onboarding, and improved security policy compliance. Nonetheless, because SSO consolidates authentication, it has to be protected against emerging threats. The use of **Multi-Factor Authentication (MFA)**, **adaptive authentication**, and **strict access controls** is necessary to counter risks. Deployed correctly, SSO enhances efficiency and security and is a must-have for today's businesses to deal with the intricacies of identity management.