In plain English
These codes are kept for times when the normal extra proof cannot be used. Each code can confirm identity once and is then no longer valid. Together they provide a fallback way to complete the extra identity check.
In context
Here, "backup codes" labels the saved single-use fallback codes for verifying identity when the usual additional authentication factor cannot be used.
- Situation
- Setting passwords, multifactor authentication, recovery codes, and trusted devices
- What it communicates
- labels saved fallback codes available from the security page
Meaning limits
The term itself does not indicate how many codes there are or how they are presented.
Examples
“When the usual extra check was unavailable, he entered one of his backup codes and then discarded it.”
“Her backup codes were folded inside her wallet for times when the usual extra check could not be used.”