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A standard flow that lets users authorize an app through another provider.
OAuth powers sign in with Google, GitHub, and similar providers. It separates identity authorization from your app’s own password handling.
Plainly
Think of OAuth as the lock and rules that keep people and data safe. A standard flow that lets users authorize an app through another provider.
In practice
Use it when a workflow touches secrets, permissions, user data, payments, or untrusted input. In practice, define the owner, input, output, and failure mode before you rely on it.