Concept Drift

A change in the statistical relationship between input features and the target variable over time, causing a previously accurate model to become less reliable.

When the meaning of what you're predicting changes. What counts as "spam" today is different from 5 years ago. The AI's rules become outdated because the concept itself evolved.

Concept drift means the assumptions behind your AI may become outdated. Your governance framework should include scheduled reviews of model relevance and define processes for identifying and responding to shifts in the business environment.