="2">
<h1><span class="header-section-number">Chapter 2</span> Working with data<a href="working-with-data.html#working-with-data" class="anchor-section" aria-label="Anchor link to header"></a></h1>
<div id="what-are-data" class="section level2 hasAnchor" number="2.1">
<h2><span class="header-section-number">2.1</span> What are data?<a href="working-with-data.html#what-are-data" class="anchor-section" aria-label="Anchor link to header"></a></h2>
<p>The first important point about data is that data <em>are</