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A login link sent by email that signs the user in without a password.
Magic links reduce password friction but must expire quickly, be single-use, and avoid leaking through logs or forwarded emails.
Plainly
Think of Magic Link as the lock and rules that keep people and data safe. A login link sent by email that signs the user in without a password.
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.