# CORE CONCEPTS

- [What is Portex?](/portex-docs/core-concepts/readme.md): Expert-authored evals for state-of-the-art AI models.
- [How Evals Work](/portex-docs/core-concepts/how-evals-work.md): A conceptual overview of Portex Evals and how they work.
- [PSDLA](/portex-docs/core-concepts/psdla.md): The Portex Standard Data License Agreement (PSDLA) is an open source data license framework.