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<title>3.1. Yocto Project Components</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="3.1. Yocto Project Components">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="usingpoky-components"></a>3.1. Yocto Project Components</h2></div></div></div>
<p>
The BitBake task executor together with various types of configuration files form the
OpenEmbedded Core.
This section overviews the BitBake task executor and the
configuration files by describing what they are used for and how they interact.
</p>
<p>
BitBake handles the parsing and execution of the data files.
The data itself is of various types:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p><span class="emphasis"><em>Recipes:</em></span> Provides details about particular
pieces of software</p></li>
<li class="listitem"><p><span class="emphasis"><em>Class Data:</em></span> An abstraction of common build
information (e.g. how to build a Linux kernel).</p></li>
<li class="listitem"><p><span class="emphasis"><em>Configuration Data:</em></span> Defines machine-specific settings,
policy decisions, etc.
Configuration data acts as the glue to bind everything together.</p></li>
</ul></div>
<p>
For more information on data, see the
"<a class="link" href="../dev-manual/yocto-project-terms.html" target="_self">Yocto Project Terms</a>"
section in the Yocto Project Development Manual.
</p>
<p>
BitBake knows how to combine multiple data sources together and refers to each data source
as a layer.
For information on layers, see the
"<a class="link" href="../dev-manual/understanding-and-creating-layers.html" target="_self">Understanding and
Creating Layers</a>" section of the Yocto Project Development Manual.
</p>
<p>
Following are some brief details on these core components.
For more detailed information on these components see the
"<a class="link" href="ref-structure.html" title="Chapter 5. Source Directory Structure">Directory Structure</a>" chapter.
</p>
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