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---
title: Cloud Foundry Concepts
---
<% if vars.product_name == 'CF' %>
Cloud Foundry is an open source cloud application platform, providing a choice of clouds, developer frameworks, and application services. Cloud Foundry makes it faster and easier to build, test, deploy, and scale applications. It is an [open source project](https://github.com/cloudfoundry) and is available through a variety of private cloud distributions and public cloud instances.
<% else %>
<%# Reset page title based on product title %>
<% current_page.data.title = vars.product_short + " Concepts" %>
<%= vars.app_runtime_first %> is based on Cloud Foundry, which is an open source
cloud application platform, providing a choice of clouds, developer frameworks,
and application services. Cloud Foundry makes it faster and easier to build,
test, deploy, and scale applications. It is an [open source project](https://github.com/cloudfoundry)
and is available through a variety of private cloud distributions and public cloud instances.
<% end %>
This guide presents an overview of how Cloud Foundry works and a discussion of key concepts. Refer to this guide to learn more about Cloud Foundry fundamentals.
## General Concepts
<ul>
<li><a href="./overview.html" class="subnav">Cloud Foundry Overview</a></li>
<li><a href="./how-applications-are-staged.html" class="subnav">How Applications are Staged</a></li>
<li><a href="./high-availability.html" class="subnav">High Availability in Cloud Foundry</a></li>
<li><a href="./roles.html" class="subnav">Orgs, Spaces, Roles, and Permissions</a></li>
<% if vars.product_name.include? "CF" %>
<li><a href="./asg.html" class="subnav">Understanding Application Security Groups</a></li>
<% end %>
<li><a href="./security.html" class="subnav">Understanding Cloud Foundry Security</a></li>
<li><a href="./container-security.html" class="subnav">Understanding Container Security</a></li>
<li><a href="./understand-cf-networking.html" class="subnav">Understanding Container-to-Container Networking</a></li>
<li><a href="./grootfs-disk.html" class="subnav">Understanding GrootFS Disk Usage</a></li>
</ul>
## Architecture
* <a href="./architecture/index.html" class="subnav">Cloud Foundry Components</a>
* <a href="./architecture/cloud-controller.html" class="subnav">Cloud Controller</a>
* <a href="./architecture/messaging-nats.html" class="subnav">Messaging (NATS)</a>
* <a href="./architecture/router.html" class="subnav">Gorouter</a>
* <a href="./architecture/uaa.html" class="subnav">User Account and Authentication (UAA) Server</a>
* <a href="./architecture/garden.html" class="subnav">Garden</a>
* <a href="./http-routing.html" class="subnav">HTTP Routing</a>
## Diego
<ul>
<li><a href="./diego/diego-architecture.html" class="subnav">Diego Architecture</a></li>
<li><a href="./diego/ssh-conceptual.html" class="subnav">Application SSH Components and Processes</a></li>
<li><a href="./diego/diego-auction.html" class="subnav">How the Diego Auction Allocates Jobs</a></li>
</ul>