Mastering SSO Implementation: A Comprehensive Guide Single Sign-On (SSO) is a nifty trick in the tech world that lets you use one set of login credentials to access multiple applications. Imagine logging into your email, social media, and even your work tools—all with just one username and password. It saves time and makes life a lot easier. Now, why is SSO so important today? Well, cybersecurity threats are all over the place.