> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.nvidia.com/nemo/gym/llms.txt.
> For full documentation content, see https://docs.nvidia.com/nemo/gym/llms-full.txt.

# Concepts

> Understand what environments are, how they power evaluation, agent optimization, and training, and how the same components serve all three.

Understand what environments are, how they power evaluation, agent optimization, and training, and how the same components serve all three.

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## Concept Highlights

Each explainer below covers one foundational idea and links to deeper material.

<Cards>
  <Card title="Environments" href="/latest/about/concepts/environments">
    Where the concept comes from, what components make up an environment, and how environments unify the evaluate-improve loop.
  </Card>

  <Card title="Evaluation" href="/latest/about/concepts/environments-for-eval">
    How environments are used to measure model and agent performance.
  </Card>

  <Card title="Training" href="/latest/about/concepts/training">
    Post-training techniques and how environments are used for training.
  </Card>

  <Card title="Key Terminology" href="/latest/about/concepts/key-terminology">
    Essential vocabulary for agent training, RL workflows, and NeMo Gym.
  </Card>
</Cards>

***