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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Common Collections</title>
+</head>
+<body>
+<h1 id="common-collections"><a class="header" href="#common-collections">Common Collections</a></h1>
+<p>Rust’s standard library includes a number of very useful data structures called
+<em>collections</em>. Most other data types represent one specific value, but
+collections can contain multiple values. Unlike the built-in array and tuple
+types, the data that these collections point to is stored on the heap, which
+means the amount of data does not need to be known at compile time and can grow
+or shrink as the program runs. Each kind of collection has different
+capabilities and costs, and choosing an appropriate one for your current
+situation is a skill you’ll develop over time. In this chapter, we’ll discuss
+three collections that are used very often in Rust programs:</p>
+<ul>
+<li>A <em>vector</em> allows you to store a variable number of values next to each other.</li>
+<li>A <em>string</em> is a collection of characters. We’ve mentioned the <code>String</code> type
+previously, but in this chapter, we’ll talk about it in depth.</li>
+<li>A <em>hash map</em> allows you to associate a value with a specific key. It’s a
+particular implementation of the more general data structure called a <em>map</em>.</li>
+</ul>
+<p>To learn about the other kinds of collections provided by the standard library,
+see <a href="../std/collections/index.html">the documentation</a>.</p>
+<p>We’ll discuss how to create and update vectors, strings, and hash maps, as well
+as what makes each special.</p>
+</body>
+</html>