# Validation data

> European Union

- Article: Art. 3(30)

## Introduction

Definition of validation data under the EU AI Act.

## Content

data used for providing an evaluation of the trained AI system and for tuning its non-learnable parameters and its learning process in order, inter alia, to prevent underfitting or overfitting;

## Official source
- [Source](https://eur-lex.europa.eu/legal-content/FR/TXT/?uri=CELEX:32024R1689#art_3)