# 12. Glossary

The most important domain and technical terms that stakeholders use when discussing the system.

| Term          | Definition                                                                              |
| ------------- | --------------------------------------------------------------------------------------- |
| AI            | Artificial Intelligence — machine learning models that generate text, images, or video  |
| API           | Application Programming Interface — HTTP endpoints exposed by the FastAPI backend       |
| JWT           | JSON Web Token — signed token used for stateless authentication                         |
| DuckDB        | Embedded analytical database used for persistent storage                                |
| FastAPI       | Python async web framework used for the backend                                         |
| Flask         | Python web framework used for the frontend                                              |
| openrouter.ai | Third-party API aggregator providing access to multiple AI model providers              |
| ADR           | Architecture Decision Record — a document capturing an important architectural decision |
| HTTPS         | Hypertext Transfer Protocol Secure — encrypted HTTP communication                       |