Single Sign-On (SSO) is an essential feature for web applications targeting enterprises, as it simplifies user access, improves security, and streamlines IT management. WorkOS offers a single API that connects your application with multiple identity providers, making SSO integration easier. By adding SSO to your app using WorkOS, you can potentially boost revenue, offload the responsibility of user authentication, reduce complexity, enhance security, lower maintenance costs, and focus on core business development. To set up SSO in a Next.js web app with WorkOS, follow these steps: get API keys, configure identity providers, integrate the SDK, initiate SSO, add a callback endpoint, and test the integration. Additionally, consider best practices such as incorporating social logins, complementing SSO with automated provisioning, proper session management, ensuring authentication comes from trusted IdPs, requiring Multi-Factor Authentication (MFA), and centralizing access to reduce security risks and administrative overhead.