# Hold-out set

URL: https://aidataforsale.com/glossary/hold-out-set
Publisher: AI Data For Sale (Marketing Signals Ltd)
Updated: 2026-11-10

Data deliberately kept out of training so it can test whether a model generalizes to examples it has not seen.

A hold-out set only works while it stays unseen, which is why evaluation data is licensed exclusively and confidentially.