In one sentence: Single sign-on lets you use one account, such as your Google or Apple account, to sign in to other apps and websites.
Why it matters: It means fewer passwords to manage. The downside is that one account now opens many places, so that account needs strong protection. You can see which apps are connected and remove the ones you no longer use.
One thing to do: Open your Google or Apple account settings, look at the list of connected apps, and remove one you no longer use.
Related terms: password manager, two-factor authentication, permissions
Learn more: How to Secure Your Email Account (It Unlocks Everything Else); Recovery Codes and Backups: How Not to Get Locked Out
Checked: 25 Oct 2026. Settings screens change. If yours looks different, search the company's help page.
