<h1 id="c4">C4<a aria-hidden="true" class="anchor-heading icon-link" href="#c4"></a></h1>
<p>The <abbr title="Context, Containers, Components, and Code">C4</abbr> model aims to provide a common set of abstractions, rather than a common notation, for modelling systems. It acknowledges that we may use multiple diagrams to represent different perspectives of the same system. It promotes "diagrams as maps".</p>
<h1 id="concepts">Concepts<a aria-hidden="true" class="anchor-heading icon-link" href="#concepts"></a></h1>
<ul>
<li>A software system is made up of one or more <strong>containers</strong>.</li>
<li>Each container comprises one or more *<em>components</em>.</li>
<li>Context</li>
<li>Deployment</li>
</ul>
<h1 id="views">Views<a aria-hidden="true" class="anchor-heading icon-link" href="#views"></a></h1>
<p>The <abbr title="Context, Containers, Components, and Code">C4</abbr> models considers four levels of views, in ascending order of detail:</p>
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<table><thead><tr><th>View</th><th>Scope</th><th>Elements</th></tr></thead><tbody><tr><td>System Context</td><td>A software system</td><td>Software systems, and people.</td></tr><tr><td>Container</td><td>A software system</td><td>Software systems, people, and containers within the software system</td></tr><tr><td>Component</td><td>A container</td><td>Software systems, people, containers within the parent system of the container, and components within the container.</td></tr><tr><td>Code</td><td>A component</td><td>Code elements (classes, interfaces) used in the component's implementation.</td></tr></tbody></table></div>


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View	Scope	Elements
System Context	A software system	Software systems, and people.
Container	A software system	Software systems, people, and containers within the software system
Component	A container	Software systems, people, containers within the parent system of the container, and components within the container.
Code	A component	Code elements (classes, interfaces) used in the component's implementation.