# Glossary

## Sandbox

A sandbox is an isolated computing environment with full operating system capabilities. It is the core runtime unit of UCloud Sandbox, where users can safely run code, install software, and manage files.

## Template

A template is a blueprint for sandboxes. It defines the sandbox's runtime environment (such as operating system, pre-installed software, environment variables, etc.). By building templates, you can quickly start sandbox instances with consistent environments.

## Metrics

Resource usage data during sandbox runtime, including CPU usage, memory usage, etc.

## Persistence

Allows sandboxes to retain file data in specific directories after restart or recreation.