The location object represents a webpage's location. It can be used to change webpages by assigning a URL to it in JavaScript. It has some other uses, most beyond this course (w3schools.com). See also window.location.reload().
Examples:
The code:
<button onclick="window.location='http://www.google.com'">Go to google</button>
<h1 onmouseover="alert('Get Lost Chump!');window.location='http://www.webhamster.com/'" style="width:300px"> Don't touch me! </h1>