# Explanation

Conceptual material that builds a *mental model* of ALF: **why** it exists and **how** its
pieces fit together, before you touch the API.

Start with **Why ALF?** for the motivation, then **Intro to Active Learning** for the method, then
**Core Concepts** for the objects that implement it.

```{toctree}
:maxdepth: 1

why-alf
intro-to-active-learning
core-concepts
```