# DRY Principle

"Don't Repeat Yourself": keep each piece of knowledge in one place.

## What is **DRY Principle**?

**DRY** ("Don't Repeat Yourself") means each piece of knowledge should live in one place. If the tax rate appears in ten files, one day someone will update only nine.

Level: Freelancer · [More OOP terms at this level](https://www.ask-codey.com/glossary/subjects/oop/freelancer)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/dry-principle