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OAuth 2.0
Authentication
A standard way to let an app access your account without sharing your password.
Definition
OAuth 2.0 is a common system that lets one app access parts of your account on another service without giving your password to the app.
In plain English
A standard way to let an app access your account without sharing your password.
Why this matters
Why it matters: It reduces password sharing and lets you control what access is allowed (and revoke it later).
Example
Example: You connect a calendar app to your email account using a “Sign in with…” permission screen.