Single sign-on (SSO) lets a user authenticate once and then access many systems without logging in again to each one. It improves usability, cuts help desk calls about forgotten passwords, and encourages stronger credentials because users only have one to remember. It also centralizes control: disabling one account removes access everywhere. The trade-off is that SSO credentials become a single point of compromise, sometimes called the keys to the kingdom, so they must be protected with MFA, monitoring and a resilient authentication service.
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