# Learn the words

Plain-language explanations for the building blocks. Explore a category, practice the terms, then check what you know.

## Core primitives

The building blocks: workspaces, sandboxes, computers and deployments.

[Practice this category](/docs/glossary?category=core)

## Organization

How people, workspaces and permissions fit together.

[Practice this category](/docs/glossary?category=organization)

## Networking and domains

Connect a running process to the people who need it.

[Practice this category](/docs/glossary?category=networking)

## Data

Choose what survives a restart, and where it belongs.

[Practice this category](/docs/glossary?category=data)

## Agents

Separate the model, the harness, the tools and the machine.

[Practice this category](/docs/glossary?category=agents)

## Runtimes

Understand the environment your code runs inside.

[Practice this category](/docs/glossary?category=runtimes)

## Billing and usage

Read resource usage and distinguish it from credit balance.

[Practice this category](/docs/glossary?category=billing)

## Platform builders

Build a product that gives each customer the right boundaries.

[Practice this category](/docs/glossary?category=builders)