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 		<strong>OpenSCAD</strong> is an open-source computer-aided design (<abbr title="computer-aided design">CAD</abbr>) software application.
 	</p>
 	<p>
-		Unlike many other <abbr title="computer-aided design">CAD</abbr> software applications which use a <abbr title="graphical user interface">GUI</abbr> to create, edit, and manipulate objects, <strong>OpenSCAD</strong creates, edits, and manipulates objects via a scripting programming-language.
+		Unlike many other <abbr title="computer-aided design">CAD</abbr> software applications which use a <abbr title="graphical user interface">GUI</abbr> to create, edit, and manipulate objects, <strong>OpenSCAD</strong> creates, edits, and manipulates objects via a scripting programming-language.
 		For example:
 	</p>
 	<figure>
 <pre><code>
 cube([2,3,4]);
+</code></pre>
+	</figure>
+	<p>
+		<strong>OpenSCAD</strong> scripts are usually stored in <code>.scad</code> files.
+	</p>
+	<p>
+		<strong>OpenSCAD</strong> includes many features similar to many imperative programming-languages; including:
+	</p>
+	<ul>
+		<li>variables,</li>
+		<li>control structures (such as if-statements and loops),</li>
+		<li>modules, and</li>
+		<li>libraries.</li>
+	</ul>
+	<p>
+		For those already familiar with programming-languages such as C, C++, C#, D, Dart, Go, Java, JavaScript, PHP, and others — <strong>OpenSCAD</strong> uses curly-brackets.
+		For example:
+	</p>
+	<figure>
+<pre><code>
+for (a =[x1,x2,x3]){echo(a);}
 </code></pre>
 	</figure>
 	<p>